I bought some twist and fit tension rods for my little house, I went to two different shops to get the lengths I wanted. I've used them to add net curtains to some of my windows.
I like the effect so much I think I am going to buy another one for the sewing room and also one for the kitchen.
These are a really great idea and I wish I'd realised this when I had first moved into the house as it would have allowed me to put a lightweight curtain up at any of the windows until I'd got things sorted.
As you can see they twist out to the right length, and the rubbery ends stop them from slipping.
Dunelm Mill had them in white (but not all the lengths) and The Range had them in white, silver and gold in various lengths. I gather they don't work well at very long lengths or with any significant weight on them, but are great for my needs.