I have been seeing mug cards everywhere, from galleries to stores...so I thought I would give one a try! This is a cut file from George and can fit on the 12x6 mat. I currently have it on the 12x12 so be sure to change your mat size if you want it on the original Cricut. The cut file is here: Mug Cut File
I used double sided cardstock for mine, but you could cut two (one paper up, one paper down) and glue them together to achieve the same look. Once cut, place glue along the bottom edge and up the side to form a pocket and insert envelope or packet of your choice!