Just discovered that if I copy a jpg from my 'Treo Pictures' folder on my PC into the '\palm\username\splashphoto\internal\splashphoto' on my pc . . then do a hotsync . . the camera pic is put back on the handheld and now seen by Splashphoto.

I only tried one but I presume you could dump all your camera jpgs into Splashphoto this way if you have a few of them!