I made these in paint last year after Portal came out. I still think they're kind of fun. I'm using the companion cube as my aim buddy icon right now. Feel free to take them if you want them.
Just in case:
Valve owns Portal. I don't own Portal. I didn't help make Portal. I didn't swipe or trace these images. I don't own a portal gun.
EDIT: It seems like when i upload a bitmap, it thinks it's a jpeg, and it won't let me put jpegs in the pixel art category. Plus jpegs look messy. I will try to figure out how to solve this.