Here is an EASY one, the Spike Ball or Spiky Cuboctahedron. If you can fold the classic origami pinwheel, this one should not give you problems at all. You can make it in various sizes, the smallest is shown here, but check out this site ...
by Think2Craft
by KIDS CARTOON DRAWINGS
by Simple Crafts
by See & Do
by srk arts
by Hack Room
by craft ideas for U