I recently invested about $40 bucks on a large sheet of black velvet from the fabric store for a photo background. I just wanted people to know that It is easy to take great display photos with a small investment.
Any black material would work well, including less expensive felt or cotton. Even a sheet would be fine. I splurged for the velvet because my wife decided she could use it for taking pictures of jewelry she makes as well.
Just lay the velvet over your couch and give it good direct lighting, such as from a halogen light. Natural sunlight, especially when the sun is low (morning/evening) also looks great on camera. I tripod really helps for getting consistent results and good focus. You can get a cheap tabletop tripod for $10 and put it on a TV tray.
So a black sheet, good lamp, and any digital camera and you can take photos to showcase your work like a pro.
-- Happy woodworking! http://www.openarmsphotography.com