obojiti

1. to paint; to colour; to dye
   Obojili smo zidove u dnevnoj sobi u belo. — We painted the living room walls white.
   Dete je obojilo crtež bojicama. — The child coloured the drawing with crayons.
2. to colour; to tinge
   Tuga je obojila njegove poslednje pesme. — Sadness coloured his last songs.

The imperfective is bojiti; for hair, ofarbati is more common in speech.