If you are into a frugal lifestyle or saving money at all, I am sure you have heard of Amy Dacyczyn and her book The Complete Tightwad Gazette. In the early nineties, she published a newsletter The Tightwad Gazette, and this book is a compilation of all those newsletters, filled with frugal advice, articles and tips on how to save money with everything you do.
Let's say your sister gives your mum some extra-wide sheets to somehow reuse. And you happen to be around before your mum starts anything with the sheets. I don't know about you, but that sounds like bath mat making time for me! Especially as I had hoped to make one on my holiday, anyhow, and therefore had my 15 mm circular with me.