You can use this sample as a start.  However, note that it won't be easy to use multiple standard skins in the same page; the official skins are designed to take over the look of all popups/items in the page...

What you need is creating a custom look that applies only to a certain class name, and then add that class name to specific popups or menus by simply adding class="your-class-name" to the respective <ul> or <li> elements.

We'll try to make things easier in a next release.

Sorry about the Longhorn skin.  I know that not all skins are suitable for being used as a toolbar.