Chess Clip Art site

might help you with Fliers and Publications

clipartheaven.com/search/chess.html

Ansi Art Chess (very cool but I guess only useful for email)

ascii-art.de/ascii/c/chess.txt

even better: http://www.chessgraphics.net/

Of course there is the free micosoft chess clip art at:
http://office.microsoft.com/en-us/clipart/results.aspx?qu=chess&sc=20