That sounds like more effort to create something which may only end up annoying the end user over time. Like the flying toaster screen savers or dancing baby animations on the internet...they got old fast.
What you may want to do is simply put text on the page that says "Please make a selection" on he background image. It will save you time and be far less annoying to the user. Trust me, the novelty will wear off. Plus, if the users sees the text, they will know that a selection did not register if they missed the button.
Something to think about.
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