As I said I would, here's a link to some more information on what I did. I couldn't find a good way to store this on ScubaBoard, so I stuck it on my Adelphia home page instead. Its 1.6 MB, most of it is because of the size of the pictures - I took pictures as I did this so I could document the process for myself.
Airbrushing a Wetsuit write-up
As far as making money off airbrushing wetsuits - I'm sure somebody could. I just happen to make quite a bit at my fulll time job. Were I to do this on the side, in addition to having really long turnaround times, I'd probably want to charge way too much to make it worth my while (it took me between 5 and 6 hours to do what I thought was a very simple graphic, I'm going to hold off on how much that would cost if I were to charge my full-time hourly wage). And I know that I just don't have it in me to pre-make stencils to cut down on time and repeat the same thing.
Actually, in Southern California, I would imagine the biggest business would come from surfers who wear wetsuits, not divers - they've got the Kustom mentality more so than divers. But, the surfers don't tend to have a lot of money (let alone the divers, who will spend there money on new equipment). If somebody wanted to do this for $10-$15/hour, I'm sure you could get business. Throw in the ability to paint surfboards, snowboards, tanks (motorcycle or scuba), etc, you could probably have enough business to make a decent living.