I have finally have a time to integrate Plurk's emoticon into my Blogger account using Greasemonkey extension. It's actually a modification to Yahoo Emoticon's script, but i added Plurk's emoticon.
You can get the scripts here. Don't forget to install Greasemonkey and add the script and you are ready to go
Update (20 December 2009): it's now updated with the latest Plurk emoticons. Go grab it again