An idea I've been kicking around, though I am certain this sort of thing has been done;
I'd love to see people come up with races, with as much or little in terms of detail as comfortable, but using only what is available statistically. This could be a race uses another race's stats directly (ex; X race uses the Dwarf's racial traits), or it could be the race uses another race's stats with certain alternative racial traits as the default (ex: Y race uses the Elf racial traits with the Creepy, Long-Limbed, and Slender alternate racial traits).