Actually, no I've never seen it if you're referring to me.
I would assume @window simulations have been done, but to actually make a DLL to subclass Khaleds custom text control to display icons before a message (that's also taking into consideration you're probably going to have to do the wrapping yourself) I don't think anyone would waste the time.
Direct URL to the DLL ? I wouldn't mind checking it out, not to use it, but just to see what it does, if it's some nasty tricks, or what.
However, if you're referring to Icons in the nicklist then sure, of course I know about that, my friend Naru made it.