If you want there is functionality to change the login appearance.
The four different aspects you can change are the following
Currently the process for changing everything except the images can be done by going to the selfservice portal and choosing your client. Then choose theme tab and set your preferences.
For changing the logo and background image, the images have to be hosted on our service. Unfortunately, you have to contact us with the image you want, and get the right url to post in the designated field to get the changes to work.