I'll describe them by the group picture order:
The top one is a 1084/15N20 120 layer four bar composite twist. My first twisted billet. I edge quenched it at non-magnetic, then tempered it three times at 400 degrees F. After cleaning it up and etching it, I then made a jig to hold the hardened edge in a trash can of water, with the softer back above water. I secured the end of my air hose in the barrell of water to keep it gently moving. I then used a propane torch to heat color the unhardened area above the water, while the moving water protected the hard edge. The bolster is raindrop mokume and the handle is stabilized birdseye maple. The tang is tapered also.
The second one down is a stock removal file (this one is W2 file). I annealed it, shaped it, hardened and tempered it. The handle is stabilized desert ironwood. I cold gun blued the blade and brass bolster. The brass pins in the bolsters are short of the bolster surface by about 3/16" and the tops are filled with black epoxy for the contrasting look.
The third one down is similar to the second one down, except I added a MOP piece to the handle, then put a couple of stabilized woods on the back of the handle. The back end is stabilized birch burl, and the one in front of it is stabilized California Buckeye.
The fourth one down is from a piece of damascus (1095/nickel of 240 layers) that I had help making with John Anderson in Gillette, Wyoming a few years back (he did most of the work welding the billet up). I had it around the shop for a while, and used stock removal to shape it. The etch was very slow and deep on this one. The bolsters are nickelsilver, the handle is MOP and Mammoth Ivory.