Re: Changing colors of menu tabs and admin bar
First, you’ll need to know a little bit about CSS to override the color scheme in the default BP theme.
Secondly, you’ll need to create a child theme to apply your new CSS changes. Read this guide to build a child theme from the default BP theme:
Next version will probably not include drop down menus in the theme, perhaps in BP 1.3 to take advantage of the new WP custom menus. For now, you’ll have to add this yourself by customizing the theme and applying a little jQuery trickery.
There are a ton of tutorials on jQuery drop down menus out there; you should be able to find one that fits your needs.
If you have no experience customizing themes, you might find this a little daunting!