This project only requires two elements. A clear plastic tube, and a color printount of the digital file provided below.
I purchased the clear tube used for this project at my local home improvement store for about $2. You will probably find them in the storage section, as they are made to store nuts and bolts and junk.
Remove the sticker on the outside of the tube.
Printout the digital file of the eyeballs using this link. The art was made from cloning together some photos of "eyeball gum-balls" using adobe photoshop.
Roll the printout into the shape of the tube and insert it.
Note: You may want to put a small strip of tape on the inside to hold it tight, or you might even fill the center with some paper wads to help it hold its shape.