Neptune site administrative areas should be easily skinnable.
In order to change the skin, open /_config/config.cfm and find or create a line that starts with the following code:
request.cftags.sebtags.skin =
Then set the skin to the value you want to use. To set the skin to "silver", for example, use the following code:
request.cftags.sebtags.skin = "silver";
You can test out multiple skins on the demonstration site.