I recently found a place called FreeButtons.com that has some really cool buttons. They're address is, amazingly,
http://www.freebuttons.com 
As for other graphics, I would recommend going to someplace like
http://www.clipart.com that has a lot of links & going from there. Or, if you have some xtra creative sisters, have them design exclusive graphics for your site!!
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SilverTurtle@greekchat.com
Phi Beta Fraternity
Phi chapter