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 Smart Gear
by ideas corner
by Dayo's craft
by WorldBookNetwork
by EzyCraft
by Alejandra's Styles
by HalloweenDrawings