Other than die cuts and cards....you can do embossing and you can cut fabric and make vinyl wall cling sayings.
you can also use the markers to outline a die cut design so you don't have to ink it after you cut it. I also used the markers to create coloring pages for my daughter of some of the die cut images. You can also use the drawn designs and color them in as front of cards.
There is so much that can be done with it as mentioned. I cut vinyl, velum, fabric, emboss...yep and making coloring pages for the babies are always a hit. I have also cut out images from the paper dolls carts and let them have at it and let them add googly eyes to them; they love it!