[olejolej]

Buils ie. for big markets: - teens - 3D printing glasses (trendy, unique) - parents - Q&A for childcare - woman - new ways of slimming

There is no one proccess for finding ideas. There are clues for finding them.

If you don't see such idea for masses then you don't undestand particular market :/ If you are a parent you often search for some child-care problems solutions. If you see problems with advices structure there, and friends find it also, then build it.

Just check also Google Keyword Tool, thera are informations - what people are looking for / what lacks.