I have had the most fun lately painting these tiny, 5x7 studies of birds, fruits, and trees. I've tried different styles, different color combos, and really "let go."
It's freeing to paint small; less expensive so you don't worry about wasting money. Frames are less expensive, too. But what I like best is that I can offer them at really reasonable prices.
I've been painting "sets" of two that naturally work together so that a buyer can use them in pairs for decorating. This seems to make sense, although I will still sell them individually if necessary. (I can always paint another to complete a pair.)
Try it! I think you'll find it as much fun as I have.