A few years ago I was struck with a serious rune-making bug. I gathered fallen branches from various trees on my property (elm, rowan, oak, birch, ash, willow), cut the runes with a small hand saw, sandpapered them smooth, then used a wood-burner for the symbols.
I never cease to be fascinated by the beautiful images and symbols that are found within the wood. One set (I forget from which tree) had naturally occuring star/pentagram shapes right at the core of several of the cut pieces. I ended up keeping a rowan set for myself, they had a beautiful reddish swirly design at the center that really drew me to them. I oil my runes to keep them from drying out too much, and stay away from varnish and paint, as I like to keep them as close to their natural state as possible.
I cast the runes on occasions where I am in need of guidance or insight with regards to certain situations, when my mind is too cluttered to access my intuition easily without the use of such tools. Sometimes I draw one rune out of my pouch, and other times I draw several to cast a spread. I don't have a set way of casting them, I just cast as the situation or my need dictates.
For many years I have been entertaining the idea of creating my own personal rune(ish) divination/guidance system. This would involve a collection of branch pieces from various trees, where it is the specific tree that is the symbol, rather than having any additional symbol added on. On a yearly basis, I could see rubbing each rune with the sap, flower or leaf of the tree the branch came from, to maintain a link between these runes to the tree, its living essence, spirit and wisdom. I'm very curious as to how this system will unfold when the inspiration does finally hit me.
Watching gardeners label their plants
I vow with all beings
To practice the old horticulture
And let plants identify me