What i do is
1. Go to http://franksicons.com/
2. Click on Upload Pics at the top
3. Browse to the picture that you want to make your icon
4. Click Upload Image
5. Crop your picture
6. Add tags and select a category
7. *If you want one picture... select size: 50 pixels and hit MAKE MY ICON*
8. Then click Download Icon... this saves it into your computer as a picture.
9. ON AIM--- go to edit.. settings .. expressions... and where it shows your previous icon...
10. Click browse.. and click on you icon... then click ok
SHOULD WORK!!!!