You can do it with U-DOO

Everyone has a cell phone and everyone is looking for a way to personalize their phone to make it differnt from others. Now you can do this with U-DOO, Check it out here. U-DOO is a new program that lets you build personal ringtones with matching avatar characters. You can download these avatar tones to your mobile phone, email them to yourself and your friends, and publish them to your MySpace page. The first 60-days are totally free. I am being paid for this post.