These items are made as an 8x10 and 8.5x11 image, so you can print them at a photo shop, BUT that does not mean you can't print them at home (see helpful link below). And they can be printed larger!
There are also blank ones and colored ones to pick the one you want, then add your own text! (see below on how to do that)
Here are some helpful links
Helpful Page about downloading, adding text and printing