I have thought it would be interesting to see a sinister elf community (Moon elves?) raid a drow encampment and steal their babies. Later on these babies would be trained as scouts and assassins by the elves, and sent out to do SEAL-missions against the drow. I love the delicate nastyness of opposite Szarkai

I also think this could make for very interesting characters with the weirdest moral conflicts. Trained in the more sinister parts of a peace-loving society, and sent to kill people who look like themselves, but who they share no cultural traits with.