Here are two more pieces I did for the 2005 Anthrocon in Philadelphia. The first was printed on the official t-shirt for the show -- in its final form, it was in color, and printed on a yellow shirt, as I recall.
If I remember correctly, this second one was drawn to be printed as a free 8 1/2 by 11 print which people could pick up and get signed at our table.
I had fun drawing it! -- PL