Do you think the color of legs [whatever the material] makes a difference?..what would you use?
I would think so unless it’s an attractor pattern, what say you guy’s? I have thought about this myself actually…
Jeanne
I’ll usually match my leg colors to body color and hackle. I just finished a fly last night where the body is mix of yellows, oranges and browns. My hackle is palmered orange marabou and the tail is a mix of orange and pumpkin with black stripes legs. Other times I’ll contrast them for example if I’m doing a slider with a fluorescent yellow body. I use white for the legs White legs and fluorescent yellow marabou with black hackle wrapped for the tail.
Rather than rubber legs, I use silicone legs. There’s a much better selection of colors and styles out there if you look at spinner bait skirts rather than the sili legs sold in fly shops.
I use yellow & white almost exclusively, & I like 'em longer than you usually see.
Mike
First, I agree with Ohiotuber as far as making the legs a little longer. I believe color definitely plays an important role, sometimes more important than others but always important. If the fish are aggressively feeding, the less important color is. Water clarity, overcast days, bright days, bluebird sky’s, the more important color becomes. I like the action of a little longer leg and it has always been more productive for me. I use the old school teaching, bright days, bright legs, dark days or overcast days, a darker color leg. This is all just my opinion.
Almost forgot, the reason I like the longer legs is for the undulating motion.
Maybe we should say if we are talking trout …or warm water…
Okie Smokie, D-Man, good point!
So, for WARM water, I’m with The Vise Varmint, Mike and like to tie longer than usual, or, called for, rubber legs too. The action is better and the turbulence/undulation, is far better above and/or, below the surface.
As to color, I’ve tied matching, to mismatching and personal opinion only… I’ve never seen much difference, in catch rate.
Also, personal opinion only, for some reason I’ve always tied my rubber legs with the thought of “the MORE garish and brightly colored the better”. I’m a big fan of the multi-colored rubber legs, in yellow/green-red/white-green/black, etc.
For Trout, the only time I use rubber legs, is on a couple of larger sized nymphs, where I’ll match the body pretty closely and on W=Buggers, where I’ll match the body color, or, use white legs.
only to a fisherman! the fish probably dont care! 
As Normand points out, it probably only matters to me what colors I use. But, it does matter to me, I have my ‘confidence’ patterns,and while I know the fish most likely don’t care, for some odd reason, I do…so
For warmwater flies for bass and panfish:
On topwater flies for bass, I never use rubber legs. Additional step, never seen a benefit to it. Catch plenty of fish without them.
Use them on foam spiders for 'gills. Here it certainly doesn’t matter. I use what happens to be at hand when I decide to tie more spiders. I have gone to the trouble to take white round rubber strips and ‘stripe’ it with black sharpie to give my spider legs a ‘mottled’ appearance. Waste of time, as far as the fish were concerned, but looks neat…
I have a simple foam hopper that I tie for 'gills that uses a strip of three round rubber legs ‘knotted’ to make the leg joint…on these I use either brown or green, to match the particular pattern (only tie two different ones).
I tie some ‘jig’ patterns for subsurface largemouth fishing. ‘Flipping’ with a fly rod type stuff…I have lots of round rubber from the days when I was making jigs, plus a bunch of spinnerbait skirts…I like browns/greens/oranges/blacks, crawfish type colors for these flies, so that’s what I use here. I do like to ‘mix’ the colors, brown with a bit of orange or green, green with some yellow or black, black with chartruese or blue, etc…
For the few trout flies I tie with rubber, madam 'x’s, girdle bugs, bitch creeks, I keep pretty close to either the body color or white for the contrast. I’ve never used more than one color at a time on these flies, but now that I consider it, I may start doing so…
Buddy
Most often I try to match the color of the body.
On my warmwater flies I make the legs shorter than most people do.
I find that this works better for me.
Rick
I don’t care so much about the color as long as the material is silicon and not rubber. I do think that the barred legs (two colors) look buggier but the fish don’t seem to care. 8T 
“I don’t care so much about the color as long as the material is silicon and not rubber.”…pretty sure I know why …but why?
I just cut up a bungee cord…some nice white rubber strands…very flexible…how fast will it deteriorate?
The silicon seems to be (and stays) more flexible and works better in the water. 8T
"Bout the only thing I use legs on nowadays is crab flies.
A striper on the flats will approach a crab fly, turn over on it’s side, and put it’s eye right up to the fly
…You can bet I try to match the color!
Duckster,
I know that the rubber strands in the bungees deteriorates faster than the ‘regular’ rubber/silicone stuff. I’ve had it stiffen up and crack on some older flies, but not sure how much faster.
I know it will last at least a year or two.
Buddy
I use ruber legs in some of my patterns. just got some “Silly Legs” from Stone River and I have some durability issues. The added flash elements from the legs seems to create week spots in the legs. I will be going back to my long wearing solid color legs and adding flash in the form of crystal or flashabou.
Buddy,
Sunlight seems to cook the bungee cord rubber far faster than either silicon or other rubber legs. Makes you think twice about those bungee cord jumps. Dang, I was going to jump but I ain’t too sure now cause of that sunlight. 8T 
Jump at NIGHT, 8T!! That way, if the cord DOES break, the ground won’t seem to “rush up, at you” quite so fast either. It may take the clean up crew, a little longer to scrape you up, in the dark, but that’s part of their job.
No sunlight at night:rolleyes:
Buddy
Do you know you can twist the rubber leg and run your sharpie down one side to stripe it.
Knucks