I'd be interested to hear of real world examples!

I've got a few ideas...& I reckon the needed circuit, & dare I say - code - can be knocked out in short order - but it's the presentation I'll likely stumble at.

To make it look pro, yoiu need to get a custom enclosure - but where/how do you get one of those?!!

I only need a small enclosure not much bigger than a 9V battery ....a few holes drilled in it (for a couple of LEDs & momentary switches)...but then there's the printing/graphics etc....hmmm - what to do?