Logging in to Twitter today, I noticed that there was a little bit of a difference to the look of the site. See images below.
I like the bar change at the top. The colors seem to match my theme, which is nice. I also like that on the home page, you can view your header image now, instead of only on the profile page (your tweets). I like the new look. They didn't change too much, but they did seem to make it look nicer.
By the way - Please follow me on Twitter @tori2103
Victoria (Tori) is a freelance graphic designer located just outside of St. Louis, Mo.