I always loved the complete and unifying ubuntu theme. More than any other distro, Ubuntu's default stands out and is whole. All I did to achieve this theme was make two minor improvements #1, I used "murrine human classic" theme because murrine is faster than default ubuntulooks and #2 I used ubuntu square window borders. To make the murrine theme better and even faster, I used new-murrine-configurator to make the whole thing square to match the borders/remove menu vertical bar/fix scrollbar/etc I am left with the ubuntu default in fast, complete, usability. Enjoy!