You can completely completely customize the look and feel of your hub by adding custom colors and branding.
First, open the Admin Console then choose App Settings:
From there, you can replace all of the various images your hub by choosing Images:
The result? Branding on the landing page and loading page:
Additionally you can completely customize the color scheme. First, you can choose to style your hub as either a Light or Dark look and feel. Then, you can customize individual colors:
You can refer to this color legend to see the effect your color choices will have on your hub's styling: