[Drawing & Coloring] Creating a theme list (grouping for images)

I would like to have my images placed in different themes (animals, plants, food… etc) so when the player runs the application, he/she first choose which theme they want. Afterward, they are presented with the images of that theme. Any idea on how I can make that possible?

Plus, is it possible to show a painted version of the image as the player is choosing which image to paint. And when he/she hovers the mouse on the image it turns to the original black and white version (like when a button sprite change when in contract with a mouse pointer). Currently the image scale in size when in contract with a mouse pointer, can I change it to switching sprite? As a way to teach the kid of the colors of the object before painting it.