During my palette knife workshops, we start painting small 4" studies on loose canvas to practice knife techniques. Here is a sampling of the ones I have done in the workshop.
I like working on the loose canvas because you can go "outside the lines" and be a bit freer to loosen up and not worry about painting a masterpiece right off the bat. The images above have been cropped, but the image below shows you how they are all painted on one sheet of loose canvas. I use Fredrix Canvas Pads for these small studies. Later, I will cut these out and turn them into greeting cards.