Teacup Box by Dina Kowal
Here's the sample I made, using Quickutz octagon dies.
To begin, I cut three 4" octagons. 2 of them are layered together to form the back, and the front panel is layered with smaller octagons. The E16019 Tea Cup Flowers is one I had colored up this summer but didn't use at the time. It worked perfectly for my focal panel.
The inside piece for this box is cut to 3" x 7 1/2". I scored at 1/2" from each long side, and then every 1 1/2" along the length of the piece, just slightly shorter than the sides of the octagon.
Have a great day!