As discussed in this hint, there is a fairly easy way to remove graphical smileys from iChat. If you'd also like to get rid of the click-to-insert smiley, just do this in Terminal, after quitting iChat:
$ cd /Applications/iChat.app/Contents/Resources
$ mv inline-smiley.pdf inline-smiley.pdf.backup
Relaunch iChat, and you should be completely smiley-free (assuming you also followed the previous hint).
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