I have a big spiral notebook that I use for designing. It's full of sketches, notes on the pattern, pictures, yarn labels, and all sorts of information I need to have handy when I'm trying to write down my patterns.
I got a chuckle out of seeing the "project pages" that my daughter made for her different finger knitting chains. She made a long chain, then saved a short length of yarn so she could make a chain to tape to the project page along with the label from the yarn she uses, the name of the yarn, and the length of the chain that she made out of each skein of yarn.
Monkey see, monkey do!