Anime-tor

Alright

I will attempt to teach you something

this is a picture i randomly chose from my files (most any will do but results will vary)

ok now we are going to make a new layer (layer>new layer) now set the new layer to color colorfill with black

now merge down

NOW, make a new layer and set it to color 

use rectangle select and select a portion making sure to leave a border around the edge

and fill with a bright color

repeat until satisfied with the results

and voila!!