I'd love to do more spec cartridge designs, but they take a lot of time to create. Right now, a design takes me about 45 to 90 minutes to create. The spec cartridges require me to redo all the specs on each cartridge manually. Most of the images that include the specs are too small for me to print, so I have to recreate them completely. I'm looking into some options and will offer more, but for now it's more of the critter designs! I like your thinking, though!