A "trivial" patent idea

Don't know if this is patentable. But it's surely handy.
In parties, people often have trouble finding their own cups. Jay comes up with the idea of sticking a number on each cup.

But that would be too troublesome for a big party. How about during manufacturing, we print different number (or colored icons) on all paper cups packed together? That way the host can distribute the cups, and each party attendee just need to remember the number on the cup.

hmmm... sounds like a trivial idea after I wrote it down. But post-it was a "trivial" idea that feed 3M for years.