I have a few old android phones laying around.

I have two app idea:

write motion activated camera app that stores motion activated pictures on google drive - special folder. Only me and my family have access to that google drive folder. Files will be deleted from that folder after N days.

   --- Turn your old phones to security camera.APP

Or another app can do time lapse pictures convert to movie where I can mounted on car's dash board and turn 1-2 hours trip into 10-20 seconds clip.

What do you guys think? Good, bad, there is an app for that already?

Any other idea?