I've been pulling them off other message boards and saving them to my hard drive then uploading them to my website to use on boards that accept html. Most of the really good ones I've found have all come from the message board at http://www.metallica.com.
I've got a bunch more I haven't used cuz they wouldn't really... be appropriate. :D
I found some fishing oriented ones also but their oriented towards steelheading. http://www.steelheader.net
I'll e-mail you the urls for the ones I have if you like.