Set a timer for five minutes. Like, when you think 'Oh, I should go through those papers,' the minute you think that, take the five minutes right then and there to go through the papers.

Eventually you may progress to 10 or 15 minute chunks. Just take baby steps.

Exercise helps also -- i am not sure how or why, but when I was taking 2-3 30 minute walks per day, I somehow got more done than when I don't walk at all.

What you said about the colors was interesting -- I think I've noticed something similar in myself but I haven't thought about that before. For me, having a clear, uncluttered room is much more peaceful. I wish I had just one room like that...