Hi,
I installed the free Quinta Group Sun/Rain theme and it works great. However, you have to make sure that you get the theme from the proper place, as I found it confusing and installed the P4 version in p5 . Not good. However, Quinta Group was fast help and told me where to get the right version.
I had the trouble because originally I got the theme from : http://themes.quintagroup.com/category-plone-5-themes
This is confusing and lead to the wrong version. Quinta Group showed me to the proper version for P5 at: