I also have an Olfa rotating mat and dearly wish I had bought the larger one. Mine is only 12 1/2 inches square.
This sounds horrible but I would love for Santa to find DH a part time job. He decided to retire about 3 months ago and I was definitely not ready to have him round the house 24/7. He keeps trying to be helpful--which I appreciate--but usually ends up either getting in my way and making me feel guilty for being frustrated with his 'help'. Ok whining finished.
I had to look up Needle Nannies. Interesting.