Great idea! My mom would love this for mother's day. She always says it is so hard to remember everyone's birthday. I would do all the work for her, make it artsy in her taste, and wha-la, perfect gift. :)
I did attempt this one and if I had any advice it would be that you find some way to cut all the triangles the same way. Like a punch or some other device that can make identical shapes. I measured and cut mine with scissors and it wasn't as crisp as this one. It's still a neat idea.