Lawn care is pretty decent. Down here you can make 60-80 bucks a month on each house....at least in my neighborhood, which isn't too shabby if you can get a whole street of houses. And that's not including landscaping...You could also paint, but that's kind of a bitch. Do little crap like that...can't think of much else.
There's also...ummm...buying stuff on auction and reselling it, all kinds of stuff. It kinda depends on your specific personal skills/trade. Like, if you knew how to install exhausts or intakes or something specialized for cars, or if you knew how to weld or something, that would be better to make money than a regular layman.