I'd picked up a silicone wrist band a while back with my ICE information on it, but kept feeling it would be a neater solution to incorporate that with my Garmin Forerunner 245 strap. This was the only item I could find on the market that fit the bill and it's a perfect fit. I've attached on the side with the buckle so it has no chance of falling off and it's unobtrusive enough that I never notice it while I'm wearing the watch.
I've had a quite a bit of interest from others since I got it. The only thing I'm not sure about is how well it will stand up to bumps, scratches and water / sweat over time, but the first few weeks have been great.