For today's writing prompt, write about someone who is literally opening a door for the first time, whether it be to a new office, a hospital room, or an army recruiter's. Spend some time on how the character is feeling while turning the doorknob. What do they see? What do they hear?
FYI, for anyone who's interested, I have "The Obeservation Deck", and it's helpful when you're trying to shake things up or come up with new ideas. Especially good when you're completely stuck.