I have a small card that I laminated and carry with me when I'm cycling, contact details, blood group etc.
However ....
If you have an iPhone (or similar) you can do it on the cheap .... create a note with all the ICE details you want, emergency numbers, contacts, blood group, etc, then save it as an image (on the iPhone pressing the home and power buttons together will save a photo of the current screen).
If you then set this image as your "lock-screen wallpaper" (Settings / Wallpaper & Brightness / Choose a new Wallpaper / Camera Roll) it will show on the phone irrespective of whether the phone has a passcode lock
Stu.