I registerd myself for teespring.com now and I must say, it is a very cool website.
Just watched someone who also showed how easy it is and it really is.
All you have to do is uploading a cool design (your own of course) and then add some colors, maybe resize, some pricing and done.
I mean of course you should add some bank account (PayPal), but I didn’t have to add it yet. I am not sure what would happen without adding it and publishing, but I tried with my favorite design and had no problems.
Felt pretty good and comfortable. Just the website didn’t respond a few times, but nothing big, just reload or waiting a short time helped.
And man there are a lot of things you can sell.