G4 accessories are underdocumented because so many of them are re-used that it's just not as fun to document them.
That said, I did take a look on MLP Merch to see if any colors match up. It looks like these pastel combs match up with the first releases in 2010. The yellow one is likely Applejack's, the purple one Fluttershy's or Rarity's, and the pink one Twilight Sparkle's. They've been released so many times that it's likely that you got them from other ponies, though.