You can use almost any image for applique. I frequently use children's coloring books to get ideas. If it is a photo, I make several copies, and adjust until I get it the size I want. I have done multiple floral quilts, as well as Sunbonnet Sue, and one with teapots. I am in the process of finishing one called Happy Scrappy Baskets ( I think it was by leatheflea). It didn't appear to have a specific pattern, so I just studied it a lot, and drafted out a similar pattern on graph paper, then added the flowers and leaves from other patterns I already had. The possibilities are almost endless, whatever method of applique you choose to use. So, as the old commercial used to say, "Just Do It"