Follow these steps to make a beautiful dodecahedron model. Even if you've never done origami before, the units are so easy to fold that you shouldn't have a problem. You should be able to follow just by looking at the steps but I'll explain them too. The hardest part is making all 30 units but if you can survive that you will soon have a dodecahedron model of your own.
Start by connecting 3 units together. Open up the flap of one unit and insert a second one into it. Add a third one into the second one and then tuck the first one into the third one. You'll see how the crease lines match up and hold the units in place.
Continue connecting units like this until a pentagon shape is made, as shown in the picture. Keep attaching more units and making more pentagons. It can get a little difficult to attach the last few units but keep at it and you'll get it.
You can now add a string and thread it through where 3 units meet or similarly attach a bent paperclip or ornament hook. These look great hanging!