This is a modified triangle box. A tutorial can be found HERE. I altered the measurements to make it a little more mass production friendly.
My specs are 4×8, (maximizing a 12×12 sheet of so saffron card stock) score it at 4″, then following the guidelines in the tutorial. I just cut triangle to fit inside and glued them in place with some snail.
Stamps: Happy Heart Day
Paper: So saffron, apricot appeal, basic black
Accessories: 3 flower punch, black gingham ribbon, Markers for coloring, black brad, tag corner punch, Circle punches for the cheese = 1″, 3/4″, 1/4″ and 1/8″ circle