With every iron-on pattern I send, I add a round card with punched holes with my name and logo printed on it to the order. If you have ever received one, you may have wondered why I sent you a card with holes in it... It's for organising your threads in a project! You can write down the thread numbers as you add floss on the card. I thought it would make a practical, small gift for my customers. Unfortunately a misunderstanding with the printer left me with lots of round cards without pre-punched holes. This means I have to punch all the holes by hand, which explains why the holes are rarely evenly spaced!
I use simple office supplies like the double or single hole punch pictured above to make my floss minders. To make your own all you need is a piece of cardboard like an unused postcard, or a cardboard bookmark. If you want to add floss numbers etc. you can write them on the back. Another option is to print your own: I found some cute free printable floss organisers at Be Dzaltastic and over at Wild Olive.