I have previously posted some paper balls I made with this same technique. I went looking for any neat papers I might be able to do this with but I didn't find any however I did find some foam sheets from the dollar store so I made a whole wack of these! If you want the tutorial you can check out my blog! http://a-can-of-crafty-curiosities.blogspot.com/ or simply read below as I have added a mini tutorial to this post
They are super vivid on the tree and give it quite the punch of colour and texture!
Here is a bit more info on how I did this:
So originally when I did it in paper I just printed out the pattern onto a sheet. But as I discovered Foam sheets don't go through a printer well, I then just traced them out. You will need 12 pieces to make each ball. I bought a pack of foam sheets for a $1.00 and used 6 sheets to make 5 balls. The pattern is really easy to make it's simply a pentagon with a half moon on each side. All you really need to do it is a compass. The degree for each angle in a pentagon is 108 degrees if you are into the mathy bit of it.
Then you cut across each half moon out half way up to make a slit, making sure you go in the same direction on every one. So they end up looking like this-
Then you simply put it together like IKEA Furniture, slot to slot on each piece. I put the side I traced the pattern out onto on the underside so if there were some spillovers with my pen you didn't see them.
Then you just keep adding pieces in, slotting them in till you get all around each side. It gets a bit tricky once you are doing 4 or 5 sides but not too bad.
I stuck on a piece of foam I cut out with my leftovers and glued that on with a glue gun.