Well, I'm not entirely sure if you mean that you own the entire sets or not, but I'll try to at least help on the proxy end of things.
From Heart of Cormyr:
"Elf Archer" Paint his robes green and armor silver/brown and you make either
Brandis Skyhunter* or
Syvarris*.
"Dwarvern Defender", if your not too picky, you can him
Migol Ironwill or
Mogrimm Forgehammer*.
For the drow, try
searching for drow customs. I know I've seen tons of those sculpts used.
*are units whom are easily acquired via
Auggies.
Happy Scaping!
Also, if worse comes to worse, you should try looking around the customs threads. You might find more there.