A custom cache could be what you're looking for. If you're on vacation with the kids or short on time, this one might not be for you. Plan to spend some time and get a little dirty. Cache is not in the street.
It's a custom to say, "Thanks for the cache" or something of the sort when logging a find. They weren't accustom to this type of cache.
Have you ever had a nemesis cache? The original A Custom cache, GC5PK02, was that kind of cache for many people. Container is still in place. Good luck!