When you click customize your kicks, the site gives you different styles to choose from. These are generic versions of classic styles which reminded me of old-school Converse, Vans, and Keds. There are adult and kid sizes available with both US and UK sizing. You then upload your image, and the parts of the shoe are arranged as a template where you can move them around so that the image appears where you want it on the shoe.
Monogenius sets itself apart by letting you use your own artwork on the shoes. Your images are professional printed onto your shoes. You can have the image appear just once on the shoes, or (and I think this looks the coolest!) you can have the image repeated all over the shoes. If you have a knack for visual design, you'll enjoy experimenting with the design tool on the site. These shoes could make great gifts, too.