I'll admit that writing doesn't always come, but I'm totally against walking around looking at the sky when you're experiencing a block, waiting for inspiration to strike you. Tchaikovsky and Rimsky-Korsakov didn't like each other and agreed on very few things, but they were of one opinion on this: you had to write constantly. If you can't write a major work, write minor trifles. If you can't write at all, orchestrate something.
Dmitri Shostakovich
composer, music, writer-s-block