Layout ThemePacks include pretty much everything you'll need to apply a consistent theme to your FileMaker file.
Within the Theme Studio, you can export the all-inclusive .zip file which may include* an importable FileMaker Theme.
Alternative methods include simply dragging the layout being viewed into your own FileMaker file. From that point you can save named styles into your own theme. It's either borrow the styling of specific layout elements or apply the whole theme to your layouts.
*Some themes were designed prior to FileMaker 12's layout changes.