I mostly play my Elf, and I've always thought that the Elves seem very charismatic. With that, I think it would be nice if the race had an ability to "soothe" or lessen the aggro range of creatures nearby so they will not likely attack or help their friends.
Having an animal pet might also be an exciting ability for Elves, one that is called forth and only stays for a short duration.
I also think temporary flight forDryads would be afun ability. Likewise, it would be cool if Dryads could summon a treant to their aid, again for a short duration. [:D]