Imagining you're sketching a bucolic scene is one thing, actually sketching it is creativity.
But since we don't (yet) have a standard use for words like imagination and creativity - like we do for business or marketing models, best practices and execution - these words are a word-jumble of sloppy, wishful, self-indulging verbage.
In an effort to help myself beyond this confusion, I go with...
Imagination is any and every dream, wish, idea or outcome.
Creativity is executing imagination - complete with failures, successes, and all the accompanying frustrations and joys.
Innovation is moving beyond what already exists, finding new applications, new combinations or responding old questions with new answers.
Entrepreneurship is discovering marketable channels for anything and everything conceivable.
But here's a caution - we all have a prejudice for one of these. One will seem sexier or more noble to us (and it won't be the same thing).
Oh, and there are very, very few people who have a true passion and expertise for more than one.
I.C.I.E (say it like you'd say 'icy') and see it if helps figure out what's missing in your mission.