Quote from Dai otaku on May 21, 2011, 6:02 pm

Custom texture
I found a way to do it(not me personalty) but i found some one who has been able to replace the textures(then spent ages finding out how he did it, he didn't say how he did it) and now i done it, this is all i got so far, and i am going to release this soon so that all you have to do is edit a texture file and it changes your first person view of the portal gun!!!