Hardly the most inspiring and exciting idea, but it pays. The only problem with this idea is that you need to be committed. Most sites won’t start to pay you until you reach a certain amount of ‘points’, accumulated through sitting through hours of mind-bogglingly boring surveys about anything from ‘how did this advert make you feel?’ to ‘use a word to describe the positioning of this word’. To the latter, ‘earth-shatteringly tedious’ doesn’t tend to feature as an answer, unfortunately.
Still, when you do reach those milestones, there aren’t too many greater feelings than that lump-sum windfall.