small buckles are easy. I often strip thrift store bags of them.
A very good book for helping figure out some of the knots (and for making other cool things) is
The Marlinspike Sailor
by
Hervey Garrett Smith
published by dover, about $16.
It has really good and modifiable instructions for the monkey fist, turks head, and star knot.
It has some great other projects, including a simple but really sturdy rope ladder, mats and such. If you work with regular 3 twist rope at all, you can do some really ingenious stuff. It even has an addendum in the back for making eye and end splices in modern core/sheath lines that works for 550. (Okay, Doc, I'm waiting for a double eye spliced 550 project from you now!)