Good Question. Somebody who has a Curve....look under >Phone >Options >General Options and see if there is an option for "Ringtone Lighting." If there is then the app will probably work. If not, then it won't.

Edit: I tried it on the Simulator (I don't have an 8300) and it appears that the Curve has the option for Ringtone Lighting, meaning it has the colored LED's, but the ColorPearl app is locked to the 8100. Probably because it caused the 8800 to lock up. Maybe Metsfan can update it to let it work on the 8300.