I started a Zazzle store the other day. I have not put up a header or made the store look nice yet. I also don't have any illusions that it's going to take off fast, but if I post enough images over time, maybe it can help pay for my time to write books. After a learning curve I find that I can post about 100 products quickly with one image in about 20 minutes (after the image is already found and prepared, which can take some time). Of course, it's going to take additional tweaking and time to make some of the products look right. This is quite an improvement over the CaféPress store interface I used a few years ago. More on that later. Although people like one of the designs, it hasn't been that successful.
I had a lot of fun late one night tweaking a seagull photo into the pink Image at the top. I also did a version that is more square, the same shape as the yellow seagull below, but facing the other direction. I like the cropping on the top image, but a lot of the products do better with the square image. I now have products online using both of these images and a couple more which I will post later. I hope I can keep it fun long enough to make a difference :-) It was fun having an excuse to use filters.