Simple. Just edit a logo so that it looks like it belongs to another site.
Here, I edited Photobucket's so that it looks like deviantART's.
[img]http://fc09.deviantart.net/fs71/f/2012/079/3/4/the_current_state_of_things_by_peejsterm-d4tc18f.png[/img]
Due to the nature of this photoshop contest, there is no exploitable.
[IMG]http://s.hruhf.in/2013-04/BookFace2.png[/IMG]
Did the obvious :v: