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The Twisted Throttle, Advrider and Stromtrooper decals are reflective. If that's an option for an NESR sticker, go for it. Have a design competition: that's how most other sites do it, although they send out the typical www.blahblah.com decals if you subscribe. I have a few....
The SVRider.com decals are slightly stylized, and seem popular.
If you want to prototype, take a graphic to a sign shop they and they will make you a sheet for a few bucks. I didn't like the commercially available Army Ranger decals available, so I scanned a real Ranger tab and had a sheet of them made at a sign shop. I keep copies in my saddle bag so I can lay them on other Rangers.
Commercial:
What I had made.