Depending on how good your printer is, and the quality of the picture. You can poster print pictures. Personally I have d/l some nice digital artwork, some abstracts. 4 sheets of paper taped together fits a 20 gallon quite well. Of course the bigger you make the picture the more pixelated it gets. So the higher quality of the picture the better ie; 1024 by768 at least. You will use a heck of a lot of ink though. I did it just to see the results. I'ts an idea at least. I like it on my 20 gallon.