These are some of the knives, scrapers and miscellaneous tools I've made the last couple of years. Some are made of O-1 tool steel though most are made from concrete nails, as you can see from the blades' shaft. I stuck the nails in rough working handles until I finished the blades. I rough ground them first and finished them with a Dremel using various bits. Some I carefully shaped, keeping the nail cool with constant water dipping to avoid having to re-harden them. Others I heated until red and let cool slowly, rough shaped them, finished them and then hardened and tempered them. The method I used was similar to the small tool tutorial presented by TStering, which I still enjoyed reading.
The "scoop or spoon" blade is my own idea. I use them for scraping or cutting concave areas. I made them by first grinding flat the top 3/4" of the nail tip to about half the diameter of the nail. Then I shaped the under side of the scoop, and finally used a small diamond ball to carefully gouge out the inside of the scoop. A lot of polishing with a rubber tip and abrasive compound.
Initially, I tried to make nice looking handles and set some of the blades in with epoxy. However, as my hands got weaker, it was easier to just drill a hole down a dowel and pound the nail in. It worked very well, providing a working and a finished handle at the same time.