Designer's Block

I'm having a bad case of designer's block. As it often happens, I start an ambitious project and I'm overflowing with great ideas. The first room I complete is phenomenal, the second one's great, the third is good, and so on, until I don't like the room I just created and I'm not sure how to fix it. What's more, I have several more to do after. I guess I tend to bite more than I can chew... See for yourself. Any ideas?