My daughter collects Shopkins. They are little toys that are shaped like various items you would find in a store. Often times there are surprise packs where you don't know which one you are getting which leads to her having duplicates. I decided to paint the duplicates. In the pics they are paired up with the original ones on the left and the one I painted on the right.
I used small paint brushes and regular acrylic paint in any brand. After they were completely dry I put a coat of varnish on top to make them shiny.