Late last night I was playing around with Preview and I decided that I wanted to make a round BZFlag icon. The square one doesn't really go too well with the Mac icons so I made one that was round to match a little better. To add it Control-Click on the file then click on Get Info. You should see a round icon close to the bottom of the new window. Click and drag that over top of your iPhoto icon on your dock. Then release it so it will open iPhoto. That should automatically import it to your photo library. Command-C the image then go to your BZFlag-2.4.app (If you don't have 2.4, you need to update!) and control-click on the file then click on Get Info.... again

-Mas