This is the ever classic-everybody-knows-how-to-make Crane. I didn't make this up but I didn't use an existing diagram. It's not difficult but does require some patience since the folds become thick. Basically fold a bill so that it's square then fold like normal. You are essentially folding 2.5 layers of paper which is why it becomes patience trying. Use something very hard (I use tweezers while at the bars) to help with the folds.

Difficulty : Beginner-Intermediate
Number of Bills : 1
Denomination Recommended : Any
Credits : No idea. This has probably been around for 500 years+.

Diagram [PDF] (None yet. Will post original square paper Crane later.)

Side
Origami - Money - Crane - Side
Side Angle
Origami - Money - Crane - Side Angle
Front
Origami - Money - Crane - Front
Top
Origami - Money - Crane - Top
Bottom
Origami - Money - Crane - Bottom