This design looks extraordinarily intricate for a 12-piece modular. It is made out of pentagons with method for obtaining a pentagon shown. The design is inspired by existing Omega Stars, the original one by Ed Sullivan/Philip Shen, and particularly by Michael Naughton's Ornamental Omega Star. It is perfect for holiday decorations, tree topper or just any other decoration. Any kind of paper would be suitable. 6" squares, the minimum recommended paper size, will render a finished model diameter of ~5". For another beautiful photo please see Maria Sinayskaya's Flickr album. She kindly agreed to test fold and proof the diagrams.