What some of us do is put a square version of a logo in the 'About' section on the home page instead of a regular photo. On the gallery pages, I have what I call a "gallery plate", which is a high-rez image with a special logo, as the first image in each gallery. Each is different by being a 'Title plate' for that gallery.
That, for me, works as a very good branding technique. Until the updates on Zenfolio give us that level of customization, we'll have to wait... not too much longer though
!
~ trace
"Do not seek to follow in the footsteps of the ancient ones; seek what they sought"
~ Basho

http://traceimages.blogspot.com/