I guess replacing the lamps with LEDs is my first real modification, albeit as small one. I replaced all the 194 mini wedge lamps in the decorative fixtures, and all the 1141 lamps in the overhead and under-cabinet fixtures. I'm very happy with the color and brightness of light these replacements provide.
I'll get another set of the 1141 LED replacements for the basement fixtures and still have some spares. Links below.
194 LED Replacements:
1141 (1156) LED Replacements:
I'm still researching the globe style lamps in the bathroom and the spot lamps in several reading lamp fixtures. I'll add to this thread once I do those.