Samsung Moment : How To Customize Lock Screen?

sorry if this has already been answered, Ive already tried looking but cant find anything on it. is there any app to customize what you want the lock screen to say? i recently had my phone stolen and luckily got it back, but there was no way the person would've automatically known who's phone it was. i know on many phones like my old palm centro i was able to write my own greeting and put who the phone belonged to, who to call if it was lost, where i live, etc. does anyone know how or what app there is that lets you fix this in case the phone is lost again. it would make it a lot easier for whoever found the phone to know who's phone it was so they could return it.