steelhead.
Look [i][b]HERE[/b][/i] for a Golden Trout.
Greenbacks and brookies are two of the prettiest but ya gatto give the edge to a fish that comes back from extinction. The Greenback cutthroat trout:
Well, not exactly extinction. It was just thought to be extinct for twenty years.
Wierd!!! It says that they both like water WARMER than other trout and that they like high altitude lakes (in Ca this is 10,000 feet or higher). That likesomeone liking warm weather and moving to the north pole!!
You aren’t looking very hard then. Just in the couple of minutes on Google I found 2 lakes that were catagorized as a easy hike (30 minutes to a hour, one was also a very easily semi flat trail) Of course for some people even a 15 minute hike is out of th question. But it is not like you have to do a overnight pack. Where do you live?
Hands down, Crimson sided Rainbows.
right here…
wait a minute, how’d that get in there…
ok, Redbands are definitely the prettiest in my book…especially the Metolius fish…
here’s a Deschutes fish:
For me it’s a toss-up between the brookie and the brown. There are still quite a few species of trout that I haven’t caught yet, so that may change, but for now, it’s those two.
TT
For me and VEE, it’s the Sea Run Cutthroat Trout in full spawning colors. I don’t think a camera could do it justice.
REE
Without a doubt, a male brookie in full spawning colors. If you want to go warmwater, I think it’s the male pumpkinseed sunfish in full spawning colors, assuming it comes from a crystal clear lake. Sunfish have the tendency to get lighter and less colorful the cloudier the water. I think it was John Gierach that said “trout are a lot prettier than they have to be.”
rw
Since we are considering Brookies (a char) for most colorful trout, I guess Brook Trout would get my vote.
Arctic Char and Dolly Varden Char would be right there, vying for a 3-way tie.
Here’s some Arctic Char pics for your consideration (these pics are NOT mine):
And some Dolly Varden pics (also NOT mine):
Yellowstone cutthroats sure do look good, as do the browns in my favorite spring creek. But, I’m with those who think that the one in the net is the prettiest.
Yellowstone cutthroat:
Spring Creek brown trout:
In the net - Yellowstone cutthroat:
Another Spring Creek beauty:
A Spring Creek Yellowstone cutt:
And then there are a few standout bows:
Someday I hope to catch a Golden Trout as well as a good Bull Trout, but until then I’ll just have to settle for what’s here in my backyard. 
Kelly.
I live in Liberty Lake. That’s a little burg in Eastern Washington between Spokane and the Idaho border.