Good ideas... I don't have a ton of time so I'm looking to tweak my existing cabinet rather than build a new one from scratch, and your plan seems a lot more involved, but I like it. BTW since you mentioned it, the RGB strip lighting is where I'm going... there are TONS of varieties on ebay and elsewhere, but I have some that has good possibilities... RGB capable, 60 LEDs/meter which is a pretty good density, 1cm wide which would fit in the center of a 3/4" half-round pretty well. Man, now somebody's gonna beat me to it...
There are many different types of RGB strip. Single color, obviously. With RGB there are probably three main types... the crappiest type uses single-color LEDs and just alternates them... Red, Green, Blue... spaced out like an inch apart. Doesn't look that great. Much better ones use actual RGB surface mount LEDs, and there are still 2 subtypes there... The more basic type allows full color control but ALL the leds in the strip are always the same color. That's not bad, would make a nice trim. The swankier ones use little shift-register IC's and are "addressable" meaning that each LED can be lit a different color. I have some plans for those too...

There are also waterproof and non-waterproof varieties, the waterproof ones either being embedded in a clear rubbery material or sheathed in a silicone shell. Neither is particularly trim-attractive by themselves and I don't really want the flex circuitry showing, which is why the half-round silicone would look good.
You did give me an idea though... I might be able to find some 3/4" "squared-U" trim, maybe in black, that I could tack to the edge of my cabinet. Then maybe find a full-round silicone tube about .5"-.6" in diameter that I could put my lighting in and wedge down into the squared trim. A little black caulk along the edge to hold them together, might do the trick. *IF* I can find the squared trim...
