A man runs out of toilet paper in a bathroom constructed of toilet paper rolls...
There's inevitably going to be down time in your life as a working artist. Down time is actually a real blessing in disguise; its an opportunity to push your envelope without fear of reprisal from clients.
Its also a great chance to hook up with some young up and coming agency creatives and produce some spec ideas with them. If they love what you've done, there's a fighting chance on their next job you could be on their list of bidding photographers.
A lot of my favorite work and a good chunk of the work that has got me hired, is the stuff i did on my own in 'down time.'