Here is the pattern for my pyramid box that I had on my blog awhile ago. You can enlarge this and print any size your printer will handle. If this doesn't work for you please email me and I will send you a pdf file.
The words on the flap say to fold outside edges to close box. What I meant to say was to fold the flaps, not the outside edges.
It's actually a very simple box. You cut the outside edges and fold everything else.!!