On a new installation of Atahualpa a "style" is used which for some may be just fine but you should check out the other available "styles" to see which might be a good starting point for you site. You can both export a style so you can import on another site with the same version of Atahualpa and you can import styles as well.
Exports and Imports are both done from ATO>Export/Import Settings. You can import one of the included styles by doing the following:
- Download the Atahualpa Theme from wordpress.bytesforall.com if you haven't done so already
- Unzip the theme
- Go to ATO>Export/Import Setting and click on Upload & Import Atahualpa Settings file
- Navigate to the styles folder which is in the zip file you just unzipped
- Select one of the theme styles and import