You can pick our own icon for the top righthand corner by using the logourl option in the routers2.conf.
For the various button icons, there are alternative iconsets available for download from the website. You can install these new icon sets in the rrdicons directory to overwrite the existing icons. Some of the new iconsets also have recommendations for colour scheme options to set in the routers2.conf -- read the readme files that come with them.
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11