I like the greeting card idea. Greeting cards are a great art format. Useful, cheap and great advertising since they get mailed away to other people and you can have contact info on the back. Leave the inside blank and you're only printing on one side. I was just experimenting with some card stock I bought at walmart and was impressed with how easy it is to make your own cards. All I have is a cheap inkjet and the results were quite promising. Of course that sort of desktop printing has some limitations but I found if you kept away from dark (inky) images the results were not too bad. I noticed in a few of the galleries there were some really excellent Christmas themed images that would make nice, specialty Christmas cards. I think Carolsassy made a good point when she suggested small, cheap presentations. Although 6 feet by 10 feet would certainly be much more impressive!