In Nimbus, the look and feel of your site is determined by the theme you've chosen. Themes are a collection of visual settings applied across your Nimbus site as well as the public areas of ShootQ (contact form, pricing pages, client area, etc.).
Most theme settings control the major site elements like navigation menu position, logo size and position, blog and gallery layout, contact form field arrangement, etc. Specific elements of a theme can be customized. The customizable elements for each theme differ, but are generally items like background colors, fonts, link colors, background images, etc.
You can configure your theme by clicking the Themes icon in the Settings area. Be sure you've selected the correct brand in brand drop down menu at the top of the page first! Each brand has it's own site and can be configured to look completely different.
Free themes are commissioned from designers for use in Nimbus. The amount of free themes available will grow as Nimbus matures.