All of these icons were created for MSN 6 by yours truly. I admit, some of them are just variations of existing emoticons by MSN. You're welcome to use all of these however you see fit. I wish I could share all my custom icons with you, but I'm concerned with copyright violation if they're shared on the web, sorry!
To save an image: Right-click (ctrl+click if you're on a Macintosh, but MSN 6 is PC only right now) on the image and choose the appropriate option to save the image to your local machine.
Tip: I use the blank smiley as a base for new smileys I create. In chat I use it when I don't know what to say.