I just found out about this contest a couple of days ago to win a Treo 755P. Basically all you have to do is make a custom wallpaper image and submit it. The program is called Dial By Photo which after having played with it now for a couple of days I must say I really like it. It is a major upgrade to the original palm phone software. The contest info can be found at http://mytreo.net/archives/2007/04/free-treo-755p-dialbyphoto-contest.html#more
Below are my pictures from a Transformers theme I made.