I have a main thread on Enworld about my campaign setting I am working on. I've got the first draft finished on the playable races/ethnicities of the setting (well, the first volume of the setting, anyways).
Dromites replace halflings and gnomes, who have been shunted off to other continents (they will be covered later, but an in-road is left in case players insist on playing a core race that isn't listed). These non-psionic dromites were adapted from Dreamscarred Press's dromites by stripping the psionic stuff and giving them a natural attack instead of the 1/day ray. The new fluff for them is based off of certain type of wasp behavior, as having massive, antlike colonies of dromites with a single queen isn't something that I really wanted in the setting.
Groundlings (from my previous post) have been changed to half-elves with an alternative racial trait. Those living golems from the previous post are going into the bestiary/GM's domain.
The alternate racial traits are options for the flavor of the setting. I like that Paizo standardised the Alt Racial trait, as it combats race bloat.