Yeah,

I have to decide what I want, then may end up mocking something up.

If it was only December, then blinking Christmas bulbs would be plentiful.

Many of the current taillights (and headlamps) seem to be highly unidirectional, when I'd like a pretty full 180° wrap around to the sides (a little less up and down).

The nice thing about a rubber band mount is that I can stick it wherever it makes sense at the time, whereas a fixed mount needs to be good for most of the time.