The last couple of days I have taken in upon myself to finish (almost) every knot in this book, the Morrow guide to KNOTS. I stopped at the decorative ones. These are some of my favorite. Some of them were easy, some of them were frustrating, some of them even had practical applications; all of them were worth doing.
If you have some free time and want to do something slightly more productive than watch tv or stalk random people on Facebook this was actually very entertaining and even quite satisfying when the knots came out perfect.
Give it a try, what the worst thing that could happen? You have a sweet book and a couple strands or rope laying around for a rainy day. Best case scenario? You have a blast like I did and learn something useful.