Free screen locker This App gives you a list of screen lockers available for WhatsApp and detailed information
Color Torch Turn your phone into a color torch.
Small application size but it has various functions
Blinker The midlet either paints a black or a white screen. Switching happens when any key is pressed. Usefull? I don't know... maybe? (perhaps when stopping a buss in the dark!? or some sort of signalling)