I have tended to think of the Seven of Cups as depicting distractions or illusions, or perhaps, at best, being presented with too many options.
But this morning when this card turned up, I began to think about the connection between imagination and creativity. We imagine something, and then (either consciously or unconsciously) usher it into the material world.
Energy goes where attention is focused. Be careful what you imagine, and be particularly careful what you wish for.