Start from a problem you have and work from there. If you don't have any (unsolved) problems then ask the people around you, you're bound to find something. But

Start from a problem you have and work from there. If you don't have any (unsolved) problems then ask the people around you, you're bound to find something. But finding and solving a problem is half the work, the other half (and hardest part) is getting eyeballs on what you built.