No, for privat projects I am mostly reinventing wheels. But, in some sense, I actually pitched them collectively during my job hunt.
My interests are spread pretty far, so my hobby projects range from building ambisonic microphones over reimplementing interesting algorithms like WFC to implementing Navient Stokes equations in JAX to optimize airfoils in a differentiable CFD simulator.
My new job reflects that, I am pretty happy with that :-)