Intro: Wire-coat-hanger-toilet-roll Holder...
It's pretty self-explanatory isn't it. Heh. I saw this once online selling through a designer website. If anybody knows the website please inform me. Post it in the comments.
So what you'd need"
1x Wire coat hanger
Steps: Follow the dimensions shown in the 2nd picture below and some good ol' guess-timation. cheers!