How can you make a picture of yourself a buddy icon without owning a macintosh computer?

AIM 6.1 - Click on "Edit," select "Settings," and then click the "Expressions" tab. In preferences, click on the "Browse" link. Select your icon with the "Select a Buddy Icon" tool. In order for your awesome file to become your personalized Buddy Icon, it has to be 48 x 48 pixels and no more than 7K in size. Save it, and you're done!