It appears that your email may have been cut off, but hopefully I can still help.
In our User Guide, in the Dataverse Management page, we have a Theme section that describes the options available.
The Theme feature provides you with a way to customize the look of your dataverse. You can decide either to use the theme from the dataverse containing your dataverse (even up to the root dataverse, AKA the homepage), or upload your own image file. Supported image types are JPEG, TIFF, or PNG and should be no larger than 500 KB. The maximum display size for an image file in a dataverse’s theme is 940 pixels wide by 120 pixels high. Additionally, you can select the colors for the header of your dataverse and the text that appears in your dataverse. You can also add a link to your personal website, the website for your organization or institution, your department, journal, etc.
Hopefully that clarifies the options available to child dataverses, under the root dataverse of an installation.
If you have any other questions, I will be glad to help.
User Interface Designer + Developer
Institute for Quantitative Social Science at Harvard Universitywww.iq.harvard.edu