Despite FordPrefect’s warning, I make a bit doing custom work for exactly the sort of businesses he describes. He’s right, though; my best advice would be to learn to walk away once it’s not worth it any more. Software work averages about $100/month, sometimes a lot more, sometimes less. Often less, these days; my day job leaves little time for this.
Also, I make a little extra throwing knives, axes, and throwing spikes and teaching people to do the same. This is fun, but I’ve only had one serious ‘student’ so far, so mostly it’s as an aside at something I happen to be at. “Hey, man, I hear you can throw anything, yeah?” “Five bucks says I can put this knife in that tree.” “You’re on!” Whirr-thunk! “Pay up!” Was it Barnum who said “A fool and his money are easily parted?” Heh. The knife throwing is the most entertaining, but the least lucrative. However, I can make a killing with it during the seasonal Renfaire.
My wife and I run a bunch of carnival-style games that we take from place to place (water balloons/rotten tomatoes thrown at my face, sink-the-boats, Jacob’s Ladder, stuff like that). It’s not great money but it does bring in some and at the right event you can make a lot. Plus, you’re supposed to insult people, which usually my wife says I’m not allowed to do. Win! The carnival games (during the summer) average $100 or more (it’s been growing this year, and we’re extending the season – I’ve got four more events scheduled before the end of October, eek!); that doesn’t sound like much but the gross is much higher; that’s just what we individually take home, after site fee, equipment rental, paying the other partners, etc…
I’ve also cleaned apartments for people who really really want to get their security deposit back. I hate cleaning, but I’ll do just about anything if the pay is right :), so I deal with it. You need a strong stomach for this one, though. I’ve never had an apartment fail inspection after I’m done with it… kinda proud of that, at least. For apartment cleaning I usually claim one-third the security deposit or $150, whichever is greater (I’m greedy). I’ve only done this maybe four times the past year, though, so it’s not as steady, if a bit more lucrative in the short term. I’ve got two apartment managers who’ve offered me steady work if I want it. Heh.