Blockposters is a new free online service that lets you create large wall posters from any image. Upload your photo, slice it up and download a PDF file to print. Sure, you’ll get stitch marks on the edges of the sheets, but hey it’s better than nothing and pretty cool at that.
Upload an image from your computer and choose how many sheets wide you would like your poster to be once printed…Once you’re happy with your selection, you can download the PDF file containing your newly created images and print each one massively blown up, resulting in a huge pixel poster to stick on your wall.
Reminds me of the Rasterbator, which works respectably well from something as small as a thumbnail picture.