If you need want to take photos of small objects to sell on Gumtree or eBay, a professional backdrop is an important part of the presentation, and you can make your own with a coat hanger and and some fax paper.
Instructables user PropPrintables shares the tutorial. Basically, you'll cut a plastic coat hanger on the bottom, insert a roll of fax paper, and use the end of a thumbtack to lock the hanger back into place. The guide also suggests using a candle to soften the hook and turn it 90 degrees, but you might not have to depending on where you want to hang it.
Once it's ready, just roll out some paper to take your photos, then roll it back up and store it in the closet when you're done. Check out the source link for a complete walkthrough.
Mini DIY Photography Backdrop [Instructables]