i still wear the same make up as i did when i had brown hair, red hair and i still wear the same for my newly blonde hair.
foundation, blusher, and either plain eyes with just mascara or lashings of black liquid liner but then again i cant see myself wearing any other kind of make up
i do think it depends alot upon your own style the shade of blonde and skin tone and even a little bit on how brown your eyes are, mine are more of a hazel colour.