I was immediately impressed with Block Posters.
You can take any of your images and then decide how you’d like it sliced up. Download the pdf file and each of these slices can now be printed out and put together to create a great big poster.
This can be used to create artworks around your home, blow ups of your favourite photos at a fraction of the price, etc. Also, it can be used in the classroom for displaying material to students, or by students to display their ideas and emphasis their points. Extending that idea, when university students have to produce posters this could be an alternative to expensive production via professional printers; I’m all for reducing the cost of education. But for an alternative approach remember Glogster.