We have been nature journaling for a while. We just just use a multi media spiral art book and pencil colors. This new school year we will be trying to add some water coloring to it. In addition to our ongoing journals I plan on starting a new journal that looks like the one on pg 14 of Handbook of Nature Study
One thing we do is have several on going pages for things we look for as we hike. It is pretty much a collage of a particular thing...mushrooms, seeds, leaves....that sort of thing. We draw the item and then write when/where it was located and what kind it is. On our normal pages we write date and where we are and/or what we were doing and then what ever we want to add....sketch, drawing with color, just journaling, souvenir, ... pictures will get a captions with a label.
I have found lots of people want to do nature journaling but feel like they cannot draw so they will not be able to do it. A nature journal can be anything that records the nature you see. A date with a short blurb is a good place to start....Feb 28, 2013 Lone squirrel tracks mare the otherwise pristine blanket of snow in the back yard... when you look back on these "blurb" journals you will find a very nice collection of nature you have witnessed. For my dd, we are taking an idea I am doing for a knitting project (knit a row on a scarf based on the color of the sky) and coloring a line based on the color of the sky. We pre picked the colors for 8 sky conditions and each day around the same time she colors a line in her journal creating a striped pattern that shows the years sky conditions...a simple journaling idea with no writing or drawing experience needed but produce a record of the sky for a year (or just do a month, or week).
Thanks for the links, some good ideas in them.