Its a storefront, affiliate, commission based shop for SpreadShirts.com. You can offer your designs for others to sell in there shops (+$), and sell shirts within your on shop.

Here is my shop, following the same naming system I've been using Winkel Shirts, I'm sorry in advance if the shirts are offensive but most shirts are these days, and they are targeted.

If you want to open your on Shop, at the top of Winkel Shirts you should find a link to Open Your own Shop!, then you can upload your designs, create shirts and so forth