Super bright LED Strips. These can be cut and joined every 5cm. They come in 1Meter segments, and you can direct wire them to 6S voltage.
I'm carrying Red, Blue, Ice Blue (lighter), Green, Purple, Yellow, Orange, and Pink.
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.
Need 12v-4S? I've got those too, in the Electronics/LED section.