All of my paintings are not light and colorful, but I admit most of them are.
I have 12 store bought colors, all acrylic, and several very cheap brushes. I mostly paint on copper or steel because I have a lot of it in my metal shop but yesterday I found hiding in the corner, a sheet of aluminum and thought I would try that. This is a mixture of paints and grinding and a little shop dust. It lived a happy and short life and then I ground it off, to be lurking in my computer, like a virus, waiting!