Just post some random picture. If you see one someone has already posted that you can edit into something lulz worthy, then do it. GOGOGO!
(http://www.midmarketmaven.com/uploads/weird-thumb.jpg)
Here's my picture:
(http://img521.imageshack.us/img521/2028/nsiderpic1511lulzpicthrbx4.png)
(http://www.owlnet.rice.edu/~amandap/mariska-8.jpg)
this has potential, go for it.