Sam has a fabulous video tutorial today for slope top box which is a gorgeous 2"x2"x2 size so I couldn't wait to try which is the blue box. I then had a brain-wave (hard for me LOL) so I decided to upsize it. The striped one is 2.5" x 2.5" x 5" so still made out of one sheet of 12"x12" DSP.
The are just my practice ones as due to leave for work so will make some more and decorate when off work this weekend.
Here is Sam's Tutorial