WordPress Twenty Ten Theme Retired
The WordPress Twenty Ten Theme was my favorite for a long time. However, it is now retired, meaning that it is no longer updated or supported by WordPress. Hence, it is recommended to switch to a newer theme.
WordPress Theme similar to Twenty Ten
I find that the Twenty Sixteen theme is quite similar to Twenty Ten in terms of layout. It has the signature top header as well as right sidebar classic layout. After much consideration and testing out other themes, I decided to switch to the Twenty Sixteen theme!
It does take some time to get used to the theme. The theme has a very clean and minimalistic look. In fact, the only downside I would say is that the 2016 WordPress theme is a bit too minimalistic, there is not enough colors other than white.