For Christmas this year I designed a pop-up Merry Christmas Card . As I designed it I knew the concept would work well for other cards as well. Today I uploaded the files and tutorial for the Happy Birthday Version. It can be customized. Here are three examples - all from the same cutting file. I just varied the card stock.
The download comes with both the scalloped and plain edge background plus all the numbers needed to customize. There is an assembly tutorial available. You’ll be surprised how easy it is to assemble.