$#@ - http://xsketch.com/profile/44797639
redevil - http://xsketch.com/profile/44797657

These two were clearly sharing answers. When called on it, redevil left, and $#@ resorted to writting out words.

Examples

Drawn by $#@, guessed by redevil:
http://xsketch.com/sketches/5719369.png
http://xsketch.com/sketches/5719621.png
http://xsketch.com/sketches/5719552.png
http://xsketch.com/sketches/5718803.png

Drawn by redevil, guessed by $#@:
http://xsketch.com/sketches/5719581.png
http://xsketch.com/sketches/5719508.png
http://xsketch.com/sketches/5719415.png
http://xsketch.com/sketches/5719295.png
http://xsketch.com/sketches/5718974.png
http://xsketch.com/sketches/5718851.png