If you omit the hackle on those, you would have what we call in New Zealand "Killer Patterns". Partridge dyed olive for sides, with black squirrel tail for the tail, is Hammil's Killer, which is a popular damsel fly pattern. Often a number of feathers are staggered up the shank (2 pairs, one tied a bit forward of the other; or 3 pairs, tied staggered as well, etc) and this can make them a pain to tie. Mallard Killers are popular, and all of the above posted look really good to me. Also, as mentioned by Panman, tying a couple feathers flat along the top is useful (that would be the standard look of a Pukeko fly here, so named because the feathers from a pukeko are typically tied in this way). Anyway, I've tied a green bodied fly with the bronze lower neck feathers from a cock ringneck pheasant in flat on the top (with a small cree hackle and olive mallard flank tail, copper wire rib) and use this as a sort of damsel or water beetle with results.

Also, don't forget that the flank feathers make great rolled wings (tied in as a typical wing). Teal, blue, and silver is still a popular sea trout fly, and I've taken rainbows with it in a sping creek. (tail: golden pheasant tippets; body flat silver mylar, rib oval silver, hackle blue, wing teal flank, rolled). there used to be a whole series of teal flies, like "teal and yellow" or "teal and red", etc, which usually had a brown/ginger/or black hackle (to suit the body colour) and the body colour was in the named colour (i..e green in a teal and green). You could tie these up just using different feathers for the wings to create your own series and experiment to figure out which work best in your waters.

I roll my wings like this:
1) get a section of fibres that is 4 times wider than the wing you want
2) fold both edges in to the centre
3) fold in half.

This results in a 4 layer thick wing. You can make it stiffer by using 2 layers of the feather to get 8 layers.

- Jeff