Papercraft has become very popular the past two years or so, and a lot of people are also creating their own models now.
And that's exactly what Ryan Mangion did: he made a papercraft Omnitrix from the Ben 10 cartoon!
In the cartoon, the Omnitrix is a device that allows the main character Ben to change form into several different aliens! (I'll let you do the guessing how many different forms Ben can assume... ;o)
Ryan made his paper version of the Omnitrix wearable around the wrist just like in the cartoon as you can see, and he also made the silhouettes of the different aliens interchangeable, so you can choose which one you would like to be!