First of all, you'll need 30 square papers. For the sake of sapping my entire origami paper collection, I just cut a bunch of squares into quarters.

Take a square so that the colored side faces you...

And fold it in half.

Then fold the side towards you back in half so that color shows.

Repeat. It should look like this.

Fold one of the corners to the side, (all layers) diagonally.

Repeat to the other side so that it looks like this.

Where there are approximately 135 degree angles, this is where you will need to fold. Fold a valley fold across both of the 135 degree angles (where the edge is folded). I know this sounds confusing, but when you understand it, it'll be a piece of cake!

It should look like this.

Now repeat to all 30 pieces. (Grrrrr!!!)

To put it all together, you will need to take the flap of one piece and slide it into the slot of another so that the folds match up.

The slot is where two creases come together on both sides. You should insert the flap into the slot where those creases are, and the folds of the two pieces should overlap.

(Here's the slot).

(Here's the flap).

This is what it should look like when you put two pieces together.

So put another piece on.

And another.

And pretty soon you'll have.....

A dodecahedron!

Happy folding!