I absolutely love this craft. Simple, cheap and can be great for gifting. Get the little ones to create a masterpiece and then reproduce the print as art pieces or as cards to send to your loved ones. Styrofoam boxes are as cheap as chips (sorry!) on eBay but I’m sure your local takeaway would happily donate a couple if you ask nicely. I can’t find the original source for the fabulous cat print* which has inspired me. There’s a lot more inspiration and instruction out there, like this and this and this.
*If it’s you, please let me know by leaving a comment and link below.