I'm sure you're all aware of The Bolter and Chainsword's interactive painters, but I came across http://www.freewebs.com/grimdarkness/painterprogram.htm the other day. Its a painting program for Eldar Guardians and Tau Fire Warriors. Not many colors and it seems as if its been in v0.2 for years, but its handy none the less.
Here is the color scheme I use on my Eldar army; they're what I imagine Ceaser's Legion would look like if they wound up in 40k somehow.
White Primer
Fortress Grey over everything except for the shoulder pads, interior helmet, elbow pads, the little thingies on the forearm, the two diagonal details on the chest piece, the cloth, the eyes and all the little round things.
Red Gore over all the little round things, elbow pads, shoulder pads, the diagonal detail on the chest piece, and the little thingies on the forearm.
Shining gold on the large round thing on the right briast plate.
Golden Yellow on the cloth.
Chaos Black on the neck and interior face plate.
Mithril Silver for the eyes.
I switch the red gore with the fortress grey every now and again.
Do I sense the power of TES over you?

He he. I actually once considered putting something in their backstory that resulted in their skin turning gray and their eyes red.

In a lot of ways, my Eldar are similar to their Dark counterparts. Only they do all the horrible things the Dark Eldar do for practical purposes. Slaves are used as canon fodder and workers, and all the horrible mutilation is used as a terror tactic, rather than to stave off She Who Thirsts. Essentially, they're a hardcoe Biel-Tan.