I found a pattern for a box like this on the Stampin' Up! demonstrator website, but it was the wrong size. So I made some modifications for it to fit the 3"x3" cards I wanted to put inside.
Edited to add: The measurements I used are as follows:
Box bottom: 9" x 3-1/2" with short edge scores at 1/2", 1-1/2", 4-3/4", and 5-3/4". The long edge is scored at 1".
Box lid: 9-1/4" x 2-3/4" with short edge scores at 1/2", 1-9/16", 4-7/8", and 5-15/16". The long edge is scored at 1-1/16".
Box band (the scalloped black part around the lid): 9-1/2" x 1", scored at 1/2", 1-5/8", 5", and 6-1/8".
I scalloped the edge of the black strip for the lid using a Corner Rounder punch (guard removed).
I have 4 little notecards and their matching envelopes in this box. This would be a cute gift for a teacher who gives notes to her students, or to a child (or parent of that child) who goes to a lot of birthday parties!
The colors I used are So Saffron, Real Red, Wild Wasabi, Bashful Blue (along with Designer Prints in those colors), Whisper White, and Basic Black. The sentiments on the little cards came from Short & Sweet. The animals are stamped onto a 1 1/4" circle, layered onto a 1 3/8" circle, and then onto a Scallop Circle. In hindsight, I think I would've liked the scallops on the cards to have the smaller 1/16" circle holes like the one on the box. I used the Horizontal Slot punch to make a space for the Black Gingham ribbon.
I hope you like it - it sure was fun to create!