I know this is not very "Professional Photographer" of me but, I can't resist! I got this Groupon today and I had to pass it on. I'm a huge fan of canvas...LOVE THEM! And I've used Canvas on Demand before and thought the quality to be to good. So if you had pictures you want enlarged in a unique way...try this!
If you're using images from a professional photo-shoot make sure you have permission from your Professional Photographer to use the image.
Of course the advantage to having your professional photographer do a canvas for you is that retouching will be included...kinda a guarantee your image will look the best it can.