paint on wood
collage on wood
glue random things onto wood, like fabric
a hookboard out of wood
Story Blocks, a project from Show Me a Story
Altered Twigs and Driftwood
The possibilities are endless, really. Just search Pinterest for wood + fabric or wood + felt or wood + paint. You get the idea.
Keep in mind that painting on wood can be a very different feeling than painting on canvas or paper. It is porous and often textured, which means that your paintbrush needs to adjust for the bumps and ridges.
Happy hunting for wood!