For Moodle2.x and Premium2.x themes, generally we provide the following features:
1) Custom Logo uploader
2) Font Size increase and decrease
3) Manage Custom Menu
5) Floating Menu
6) User picture enable and disable
7) And the color controller, depending on the theme you can change the banner colour, background colour etc.
How do we control them?
All the themes are equipped with all the necessary documentation about managing the features. You can get this at index.html of docs folder in your downloaded theme.