Though illustrating can sometimes be a slow process, if you’re capable of making high-quality images in a short time, you can supplement your income with an illustration business. Cartooning, sketching, and such are in-demand and being able to provide these services can set you up with a steady stream of clients while you work a limited number of hours a week.
As a result of urban growth, and more people moving to the city where their yards are small (frequently only a balcony), the bonsai tree business has boomed. There is a great appeal in owning tiny bonsai trees, which might be only 18" high instead of 60' high. Business owners can be very successful since both local sales and Internet sales are becoming extremely popular.
Anyone who is artistically inclined and enjoys animals may like running a pet portraits business. For those who like to draw, paint, or work with another medium, doing commissioned portraits is a great way to earn an income creating art. Loving animals helps business owners stay interested in their work even when they’re working on animal portraits several days in a row.
I created an “Every Day I’m Hustling” shirt and sold enough for the campaign to ship, but didn’t earn much on the experiment because of some not-very-effective Facebook advertising. Still, some opportunity here and a friend of mine is doing REALLY well with this. If you can create awesome designs and reach the right people with good Facebook targeting, Teespring can be very profitable.