Posting this, as several people have been playing around with pentagons lately:

The 14 Different Types of Convex Pentagons that Tile the Plane (at mathpuzzle.com)

a wonderful set of visual examples of the 14 known tilings.

I found (re-found?) this site, from another site I have bookmarked- Marjorie Rice’s pentagonal tessellation page:

http://home.comcast.net/~tessellations/tessellations.htm

worth looking at as well, especially this design…