One of my favorite ways to paint on canvas is to create a Silhouette Landscape. You choose your colors for the background and blend them till you are satisfied with the outcome. Then you add your black designs to the front. My absolute favorite has to be the sunset with the pond scenery.
Here’s a painting I tried using just gray-scale on canvas and acrylic paint.
I love the way the sky looks with a moon in it. Of course I have to add trees to my paintings. I just love trees.