Cube
Dollar bills are close to having three-by-seven proportions, and this cube takes advantage of that fact. There is a lot of precreasing for most of the steps, but once the folding begins, everything collapses quickly into place. The repetitive wrapping sequence creates two faces with a fancy pattern.
1 Lightly precrease.
2 Place a light pinch mark halfway along the top edge.
3 Precrease from the corner to the crease, folding sharply where indicated.
4 Valley fold the bottom edge up at the intersection indicated by the dot. This should be at one third the width.
5 Unfold.
6 Precrease the top section in half.
7 Precrease along the angle bisectors.
8 Precrease where the step 7 creases hit the edge.
9 Precrease along the diagonal.
10 Precrease where the step 9 crease hits the edge.
11 Precrease through the intersections of creases.
12 Precrease along the angle bisectors.
13 Valley fold toward the vertical crease. The edges will not line up perfectly.
14 Swivel the sides in, allowing the edge to come up at 90 degrees.
15 Swivel in the sides again, pulling the box section inward.
16 Swivel in again as in the previous step.
17 Continue the swiveling process.
18 Form another set of swivels.
19 Roll the cube section over one last time.
20 Tuck the flaps into the side pockets.
21 The completed Cube.