If you want to add a little excitement to your MakerSHED gift certificates, consider giving them in cube form. It just takes 6 cards and simple folding to create a cube. I have been making cubes from my old business cards with the instructions by Ned Batchelder.
All you have to do is put one card perpendicular to the other card. Fold the bottom card up around the top card. Flip it over and repeat. Do this 3 times and you have 6 sides that can be assembled into a cube.