Making jigs is easy. One of the best jigs I ever used was a green 1/64oz jig head with barbed collar. That's it, just that jig head and a waxworm. Not sure what was up, but that jig always out fished any other I tried.
Personally, I find it annoying to sit in the garage at 0º and pour jigs when I can just buy them for pennies each. I buy the raw jigs and then paint them myself. Bass jigs and open water jigs I pour myself, but not cheap little ice jigs. Soldering in the basement is a little different, that I don't mind.