I really like the green and purple leather. It would make lovely little pouches, too. The purple inside would be a little surprise when you opened one up!
Those are great stamps. I actually intended to carve one to go with my pages too, but I was making 60 other Yule cards at the same time and just didn't have time for even a simple one. (Homemade cards is a long-standing thing in our household, and this year they were collages, which took even longer than usual.)
A little book that you can carry with you is a great thing. Myself, I'm too scattered for that - the book is never where I am - so instead I have a number of little notebooks (I mostly prefer the little orange Rhodia
pads) scattered through various jackets, pockets and bags so that one is usually nearby when I need one. But I do have a little bound notebook that I keep on my bench at work for exactly the purpose Betsy described, and it's gradually filling up with recipes, spells, book titles, song titles, etc.