Use whatever you have for brushes - even sponge brushes or cheap hardware store brushes will work. I uses these Dynasty Brushes from Blick.
A couple of the craft paints I use are Blick Matte Acrylics, which are very opaque. They are a little more expensive than DecoArt - type craft paints, but still very affordable. I suggest you make a few of these, and tape or tack them to the walls.
The nice thing about prints is that you can get them much larger than the original paintings.