Modular Star
One of the most prolific origami authors is the Japanese expert Tomoko Fuse, who is most famous for her decorative multi-piece boxes and modular stars. This star has long been a favorite, and you should find the assembly fairly straightforward. The units themselves, 30 in total, are also quite easy to realize. Use sturdy paper with the same colour both sides, as trying to work out an appropriate colour sequence with the final construction can be quite a challenge in itself. Furthermore, many people feel that this works better since it allows the modular piece to be seen as a whole; lots of bright colours can sometimes distract the eye from its simplicity and elegance.