Heh, there are a lot of annoying things about say2... but almost every server uses them(I can't think of many servers that have custom sign systems), and I think every classic server definitely does.
I wouldn't argue against Stefan converting them to GUI... but I doubt that will ever happen.
As for the original problem... I honestly don't know. I can't find anything on the wiki, but have you tried something like:
PHP Code:
say2(#i("head0.png",0,64,32,32) @ " hello there");
?
Oh, and Chris brings up a good point, try html("<img src='head0.png'>") and see what that nets you.