If there isn't a patent on this... do it! I'm sure some far eastern manufacturer of useless USB peripherals would love to make something like this and flog it around the world... and you should get a little bonus every time one of these sells!
Think it over, anything it seems is marketable and sell-able these days (take a look at the kid who sells pixels for $1 each and is up £40,000 so far o_O )... and i'm sure you're beer chiller / tea warmer would be an ideal hit.
As an engineer (by education; as profession, I value the business of money earning more!
) i'm finding this very interesting,.. keep up the good work! :thumbs: