I'm getting pretty into thinking about LED mods, and one thing I haven't heard anybody talk about is adding fader effects to existing lamps or replacing lamps with faders. I found an interesting article which might be useful to somebody with a little more electronics savvy than myself:
http://www.pcbheaven.com/circuitpages/LED_Fade_In_Fade_Out_Dimmer/
Seems like it would be a big seller if somebody could made a kit for doing this...I kind of glaze over when I see breadboards and circuit diagrams...but I know it isn't all that complicated to somebody who knows what they're doing!