Default Themes that work in both Portrait and Landscape views

I was just wondering, is there any good themes that would work in both Portrait and Landscape views? Or is there any way to have your phone switch to another theme once your phone goes to Landscape view?

The reason I ask is because I use my phone in my car on my Pioneer AppRadio enabled headunit. I would like to have a new/fresh theme on my phone, but I would also like everything to work correctly when the screen is displayed on my car's head unit.

Any ideas? Thanks in advance