When I posted a Stamping on Canvas challenge on our Facebook Group a couple of members asked me for ideas on creating backgrounds on canvas. I've posted 3 tutorials to our gallery in the Techniques - Studio Paints section. I created these on chipboard covered by Studio Canvas and painted each with gesso. I limited my color palette to 4 colors so people comaring each could decide which to try based on overall look rather than color preferences. These techniques could be created with any 2-3 colors that can be mixed to make other pleasing colors. A good example besides modern red, dab of yellow and sable brown would be landscape green, dab of yellow and classic teal. This is because if you mix any two of these colors it will create a pleasing color. You could not add orange into the mix instead of yellow with as good an effect because orange and teal, which may look good opposite one another, will not blend to make a pleasing color. If your color combinations don't turn out like you want simply paint over with another coat of gesso once the paint is dry and try again.
Here are a coupe examples of finished canvases I made with similar backgrounds. The butterflies, from our Essential Elements series, were stamped on slightly differently colored Studio Canvas, cut out, and adhered to the background canvas with some mini pop-dots under the wings for dimension. I also added some German Foils as embellishments and stamped images from our Grunge It Up stamp series.