There is a rule in the novelty industry that you can take an established product and get an entirely new product just by modifying its size to either comically large or super tiny.
The rule says:
Big is funny. Small is cute.
It seems to me that this rule is a good possible initial way to approach any idea that you have. Would it be better bigger or smaller? If you have an established idea, do you get anything interesting by scaling it up or down? It’s also a great way to revitalize an idea that has gone stale.