Unusual Android App For the Darkroom Needed

Does anyone know of an Android app that can turn the screen monochrome? I want to use my phone in the darkroom. I'd like it to be a timer and a media player. It would also be nice if it could act as an exposure meter for the enlarger too, though that is probably asking too much and would certainly be a separate app. For this to work, I need to be able to have the screen be a safe color. The ability to change that color might be nice. Then, it could even be a safelight for the room if I need a color other than my red lamp. I imagine it would require rooting the phone to have that kind of control, so I can do that if necessary. So far, I haven't found anything.

Cyanogen 6.0 lets you do that: you can turn the entire device monochrome, and set it to a colour of your choosing.

http://estrip.org/articles/read/52264/cyanogen_mod_6

(You will need to root your phone, and install a new rom).