I usually use Creative Commons license, so you can put the work with my name in your Blog. It would be nice If you link to my page.
Although I give my work away, I don't recommend that you print these pictures. Imagine: you're maybe a person with no experience in quality printing. These images are highly compressed and optimized for web. In this case I recommend the contact form and we'll see what we can do. This has two important benefits: You get a nice picture for your home printed by me and get it without the watermark.
Also I want to highlight the design of pictures and their print. I would never, ever print one of my pictures on canvas or any other structured paper. This would be an disaster to quality. So in general, use the contact form and get in touch!