Ambrosia theme is the one you are looking at right now. I’m really happy with it and just today there was an 1.3.4 update with a couple of additional languages so I wanted to contribute.
You can get this theme from here or by searching the wordpress repository.

I have created the polish translation for this theme. You can download the language files from here: Ambrosia theme polish language files.

Simply install the Ambrosia theme and upload pl_PL.mo and pl_PL.po files to wp-content/themes/ambrosia/lang directory on your server.