Ask HN: What are your freelance contracts like?

I was reading the comments section for the "Ask HN: Why don't companies hire programmers for fewer hours per day?" (https://news.ycombinator.com/item?id=12161693) post and several people appear to be freelancing (and enjoying it at that). I was wondering, what kind of freelance work are most of you engaged in? What are the scopes of your contracts, and do clients primarily approach you or do you approach them?