Like what I have in my sig? An image link to Tech-Forums?
I use a random from Sloganizer.com:
[u rl=http://www.techist.com/forums/][i mg]http://www.sloganizer.net/en/style3,Tech-Forums.png[/img][/url]
I also use a link button from OpenDNS:
[u rl=http://www.opendns.com/share/][i mg]http://images.opendns.com/buttons/use_opendns_150x40.gif[/img][/url]
And a "No Clean Feed" button in support of our Aussie friends:
[U RL="http://nocleanfeed.com"][I MG]http://nocleanfeed.com/nocensorship.gif[/IMG][/URL]
While we don't have any buttons of our own, many here could whip some up in nothing flat. Hmmm... that may be the seed for a contest in the near future...