In this article from Martha Stewart’s website, she shows how to stencil a clock directly onto a wall. I loved this idea, and decided to see what clock face stencils might be available to speed up the process. A quick search found several possibilities, of varying sizes.
For a more whimsical look, try Stencil Planet‘s Melting Clock.
And last, but not least, here’s a classic clock face, shown left, from The Stencil Library.