I have made little business card sized things with name, birth date, contact phone numbers, doctor, cycling club and blood groups on and had them laminated for the cyclists in this house. They live in the under-seat bags with the spare tyre and cell phone. That way we don't have to remember to take ID - its alwys there.

But I must admit, I hadn't considered necklace or bracelet ID - might look into that too

Good discussion - thanks ladies