RSTUVWXYZ by Meenakshi Mukerji
Number of units: 72 (9 colors, 8 pieces per color).
Designer: Meenakshi Mukerji
Here. Also, check out Assembly Guide. Instructions also found in the book Ornamental Origami: Exploring 3D Geometric Designs (2008, 154 pages) by Meenakshi Mukerji. To get started with models like these, check out How to Make Intersecting Plane Models.
Individual modules are very simple. Assembly requires patience and visualization. Took me about 4 to 6 hours to finish. The overall design is 'nine intersecting stars', one star per color. Each star is in a plane -- notice the star made by brown paper in the picture.