I think that on the back of a black shirt, in white writing it should say "the person beside me is a killer... call 911."

an edited version of the mccain-palin logo but with McCloud-lombardi or McCloud-krystal like from starfox. or Mario-Peach. what do you like best?

(I) Never leave home without your(my) warhammer
I had a picture I drew but I can't find it how lame.
It was a cute girl with a huge warhammer. Anyone can probably draw better than me anyway.

"Master Chief is my Dad"
could be just words or maybe someone could come up with a suitable picture to go with it?

a picture of a bunch of bug pokemon and it says
"stop bug'n me"

a picture of yoshi and it says "lets ride"

What about A hoodie that covers a lot of your face and looks like Altair from Assassin's Creed?

I can't draw at all so here is the idea with a random googled pic.

A 5-star general rank pic with "This is not the symbol of a five-star General" Above, and then "This is the symbol of a five-star N00BINATOR" Below.
Noobinator could be in a scratched-out test or something? (like the pwn in the "I pwn noobs" shirt.)

Ideas? Could be pwner, pwn3r, owner, etc. instead of noobinator.

a picture of a starman from mario (or earthbound)and it says "theres a starman waiting in the sky" from the david bowie song

a super nintendo with a cape flying through the sky

A picture of Jynx the pokemon and it says "Don't Jynx it"

havent been able to work out a picture for it yet, but i thought of an online dating add, with an orc in the picture, and something like, 'Lvl 40 Orc seeking Lvl 35-40 Elf for commited relationship' and throw in a couple of typical dating profile comments with a geeky twist e.g 'enjoys long walks through dungeons' could do with a few more ideas

"my other car is the Mach 5" and then beneath is a picture of the car at an interesting angle.

This design has been in my head all day and I think I finally got it right... whatcha guys think? ^^

You're a midget, not a dwarf. (PICTURE OF BATTLE AXE) Dwarves have battle axes.

"The most sexy thing you can wear?" (on the front)
"Your smile!" (on the back) alternatively a smiley

together we are: GAMERS. Now go kill someone... in a videogame, of course.

Picture of a "cheat" webpage and the slogan underneath "No Child Left Behind"

well this could go in text only but what ever
a giant nuke cloud mad out of pure text (like in the drawing threads in the forums you might frequent)

a shirt with "want some of this, bitch?" with an arrow pointing down or a white shirt with a cake and under a "i <3 cake"

Mario hitting question block.
Slogan: Tackling the big questions of life head on.
or something else along those lines...

No image. Just words.

"You're one load your mom should have swallowed."

it has mario with a hammer and it says "one man Wrecking crew" a referance to the old NES game wrecking crew

a beanie of diglett

it has mario hitting a brick block and it says "hit the bricks"