Super bright LED Strips. They come in 1Meter segments, and you can direct wire them to 3S or 4S voltage or a 12v regulator. These can be cut and joined every 5cm.
These are the skinniest yet, only 3mm (2.7mm )wide to fit on your micros!
Here's a tutorial worth checking out before you install them ;)
Need 6S? I've got those too, in the Electronics/LED section!
There's a 1 in 5 chance that your strip will come pre-soldered with a wire, I prefer to DIY with a silicone jacketed motor wire, a dab of conformal coating, and a centimeter of heatshrink tubing.