A few years ago I bought a full roll of 3M's "retroreflective" self-adhesive vinyl to make my bicycle more visible at night; Google "brightbike" to see some examples. It's a very unusual material; it looks just like normal vinyl in diffuse light, but is highly reflective to directed light (such as from headlights). It really pops and is the same stuff that makes stop signs so visible at night. It's available in just about every color, even black, which I still have a hard time wrapping my head around (it's black during the day, and shines white, brightly, at night).
It's not at all flexible side-to-side, but it comes in wide rolls, so you can cut shapes out of it to fit just about any surface. It won't conform well to a surface that's curved in two axes, but anything curved in only one axis (like bicycle frame tubes) are a piece of cake. It sticks very well and should be tough as nails; it's designed for sign-making.
Since the roll I bought is black, I could cover some of my 2014 SR's surfaces and not change its appearance much. I'll have to think about it...if I can do it and not make it look cheesy, it might be a very good safety addition to the bike.