A while back I bought a few small canvas panels, for playing around on. The large ones are 6"x8" and the small ones are 4"x6". This also makes it easy for framing as these are common photo frame sizes.
I decided to try a few landscape scenes in acrylic and was trying out a few techniques I had picked up from some youtube art lessons. I'm quite happy with the result and might just do a few more small paintings when I need a break from my commissions. They also make for lovely gifts.