I don't know how well this'll go down from a copyright point of view, but until someone cries foul, here's the stuff I did to make the Sasha poster I have behind my decks:
I couldn't find the one I made, but luckily found the original in an old post on here somewhere and touched it up.
I'd then just used photoshop to blow it up to 100x75cm - made it black and white, added a 'Half-Tone' filter to take care of the pixelation (it gives a texture instead of pixels) and then took it to a printers to print onto poster sized paper.