Tempera on canvas.
You can get really inexpensive canvases at A.C.Moore or Michaels or any arts and crafts store. Owen made these with his Uncle Wes, when he was just about a year old. I took him outside, put him in just a diaper and let him go nuts. I gave him a variety of brushes to experiment with and let him use his hands...and feet. It was great! I plopped him right in the tub afterwards and he was good to go. This is what he looked like while painting. As you can see he really had a good time exploring the squishy paint. These were also sealed with a clear spray paint after they were fully dry and away from Owen.
Tempera with sponges.
I cut up a sponge to make some snowflakes and a snowman hat and we used a cup to make the snowman body. Owen experimented painting with sponges. He really enjoys using different tools to apply paint. Some other things we have used are a plastic fork, fabric scraps, a potato, foam stamps, the other end of the paintbrush, grass, a flower, and leaves. This painting was just done on black construction paper.
Tempera on paper board.
My husband had Owen paint this for our younger son for Christmas this year. Tempera gives nice bright colors as you can see here. This was spray sealed after it was dry as well.