If it's Portal related, one must have it... simple:


The gels are available from ThinkGeek and cost between $14.99 - $39.99.

The product description is as follows:

Fully licensed Portal 2 collectible - to make you feel even more a part of the game.
Non-toxic and won't leave a gooey residue on your hands.
This putty is very strange, behaving like a liquid and a solid. It drips, bounces, stretches, shatters, and all sorts of other weird things.
Three Color Choices:
Repulsion Gel - Blue
Propulsion Gel - Orange
Conversion Gel - White
Or, get one of each with the aptly named Set of All Three!

VIA Nerd Approved