How do you feel about maybe using colloquialisms, cliches, or metaphors as open-ended types of themes - ones where there's considerable leeway in interpretation?

For example, a metaphor theme of 'Slippery Slope' could lead to fics involving the team / a team member dealing with a tricky moral issue that threatens their integrity; or, to a story in which something the team / someone does sets off a chain reaction of events; or, if taken literally (not as a metaphor), to Daniel (who else?) falling down a mountainside.

Would those sorts of themes work for you?

And/or, what about themes of a single word that commonly has more than one form/meaning (eg, 'duck', 'bear', etc)? Or, is that a bit too open-ended?