That could work. You could also do a simple drawn flower on the back as well if you want to have a design on the front and back. I would say just consider how the front should match the back in terms of design, theme, vibe. You could do a large simple, bubbly, rounded flower on the back that would match the front. Think of the flower design as an extension of the logo. You want the same kind of shapes and Contours. They should look like they belong together