A lot depends on your printer and ink. Some are going to give you better results than others, and some can print up to ledger (11x17).
You can print on any fabric, including prints if you want. Simply iron your chosen fabric (right side up) onto a piece of freezer paper and do a nice clean cut 8.5x11, or whatever your printer will accept. I'm typically using Kona solids and not the by-the-sheet stuff. This past November though a friend helped me with photoshopping a picture onto a graphic and we used her printer and sheets. She's taught photo-quilt classes and knows what she's doing.