I want a particular kind of backdrop for my shelf layout, and I created this one in Photoshop. Each panel is 150" x 11", and the ends blend according to code (A/B/C). What I have posted here is a small version @ 300ppi & 250kb. You could download this and expand it to full size. At 72ppi, the full-size panels don't look pixelated.
Or you could send me an email address, and I will send you the full-size file -- about 2mb. The height of the file is 36" because that's the size my local print shop uses for banners.