Donald pooh-pooh's Fairies? And he lives in Seattle? Best be careful next Halloween. I guess it would depend a lot on what sort of artistic statement you are trying to make with the poster? One sees extreme enlargements from a TV capture all the time; scan lines, noise... If that's what is in mind you should be OK with just Photoshop. Rember to use the Video>Deinterlace filter. There are programs out there (though I can't recall the company), that will combine several frames of video to get a higher resolution image. This stuff won't help you too much if your subject of interest is moving. [In very simple cases, like reading vehicle license plates, this can work with motion.] Otherwise, an overhead projector and paint brushes may be the most fun. But you should be able to enlarge the image as much as you want (in photoshop, etc.), and use this as a reference layer (in photoshop, illustrator, painter).