Bountee.com is a great idea. Upload your favorite SVG files and make t-shirts. But also add a % commision and/or limit the number of shirts sold. Commision goes into your PayPal account. 
Bountee.com takes care of all the printing, selling, and shipping! They get at least $16.99US per shirt, I get whatever my % comission is on top of this. 
Here are my shirts. I’ve already sold 1 shirt!
This could be a great little micro-income…we’ll see.
Now I just need to integrate the shirt feed into my site. 
