This is the SideBar Header

Curabitur vehicula tempor orci. Sed vitae turpis. Sed sit amet felis quis urna pulvinar lobortis. Donec id sem. Duis sagittis. Morbi laoreet urna id ante. Cras aliquam porta ipsum. Donec ac orci. Curabitur sed risus ut libero cursus suscipit. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Sed rhoncus dignissim nunc. Nam at pede. Sed auctor urna et tellus.
MONDRIAN
Mondrian comes in five versions (5 themes!) with the same look and variations but a different menu:
Mondrian Top Split has a Split Menu, so only the submenus of the current horizontal link show up in the Sidebar left or right: example
Mondrian Top Dual has all submenus in the Sidebar: example
Mondrian Side has all menus (all levels) in the Sidebar left or right: example.
Mondrian DropDown has a dropdownmenu (transparent or backgroundcolour): example this page.
Mondrian Horizontal SubMenu has a Submenu just below the Topmenu (with one or more sublevels) or below
the HeaderImage (only possible with one sublevel): example.
Add a flash header with BannerZest. Brian Morgan wrote a tutorial how to fix this.
• NEW • There's one ExtraContent area installed in all Mondrian Themes
above the Footer (see darkblue area above the Footer on this page).

All themes have many theme variations.
The most important are the multiple widths of Sidebar and Content, the option of the SidebarHeader at the bottom of the headerimage (see this page) or on the left part of the headerimage (see this page) and the horizontal lines and beam (which you can disable or give a pattern or any colour with the Colour Palette).

The Sidebar is the most forgotten of areas in a Theme. So many users are looking for ways to enhance the Sidebar's functionality. This Theme can give you the feeling of Two Columns.
THIS IS COLUMN 1. This is the ExtraContent ("myExtraContent1") above the Footer. You can style this area with the MONDRIAN ExtraContent (in Custom CSS) Snippet.
Consectetuer adipiscing elit. Proin nec erat. Praesent vel sapien id enim commodo ullamcorper. Maecenas posuere lectus egestas ligula. Cras vulputate, nisl a varius pretium, erat libero fringilla lectus, quis faucibus velit quam vel pede. Sed gravida interdum turpis.
THIS IS COLUMN 2. Colours can be changed in the Colour Palette in the Theme Styles. See the ReadMe file. Replace this text by your own text and/or images.
Consectetuer adipiscing elit. Proin nec erat. Praesent vel sapien id enim commodo ullamcorper. Maecenas posuere lectus egestas ligula. Cras vulputate, nisl a varius pretium, erat libero fringilla lectus, quis faucibus velit quam vel pede. Sed gravida interdum turpis.