Related link: http://www.devguide.net/var/bsd-firewall-stickers.zip

Here are some BSD and firewall sticker designs:

DragonFly BSD — Because There Are Other Alternatives

FreeBSD — Because There Are Other Alternatives

NetBSD — Because There Are Other Alternatives

OpenBSD — Because There Are Other Alternatives

OpenBSD — Painted Puffy

IPFW — Building a Better Firewall

IPFilter — Building a Better Firewall

IPTables — Building a Better Firewall

PF — Building a Better Firewall

Copyright? You are free to print and sell/give away these designs as long as they are used to promote DragonFly BSD, FreeBSD, NetBSD, OpenBSD, IPFW, IPFilter, PF, and IPTables in a positive manner. The Puffy image is copyright Theo de Raadt

Have fun.