The sakasa kebari is considered the iconic fly of tenkara. I dig it. The way the reversed hackle flows in water is great and seems to entices fish. I have yet to fish it, but I soon will. They work well for bluegill and bass so I'll have a hay day with my 5:5! All you need is hackle and thread. I love the look of pheasant on kebaris. Not sure what it is, but it just seems to fit! My favorite is the one in the center. It's made with pheasant and a greyish blue thread that I found in my grandmother's sewing kit.
This is a sweet little pattern that you can get from Chris Stewart at tenkarabum.com. He runs an excellent site with seemingly unlimited information, product reviews, and essential items for tenkara. I caught my first fish on a tenkara rod using this pattern. It's super simple, but very effective. It's a hook, yarn, and copper wire. No thread! Oh and you can color it with a marker that comes with his killer bug kit. You get everything you need with it at a very good price. These are size 12 flies which seems to be the golden size for whatever reason. Try it out!
Hook: Standard nymph or scud hook
Yarn: Shetland's Spindrift (colored with a prismacolor marker, see link above)
Wire: Small copper
Super glue is needed for the copper underbody or the materials will slide.