I've been working some more on PhotoWalkthrough desktop wallpapers and I've made a collection of 5 different colours schemes quite reminiscent of the Mac abstract or the Vista wallpapers. You can see them all in the Wallpaper Gallery and download them as zip files or windows 7 theme packs.
I've also added a new Promote PhotoWalkthrough section to the site where you can download logos, information and images related to PhotoWalkthrough. This is the place to look if you want a PhotoWalkthrough logo for your site or blog and I'll add lots more to this section over time. For now I've added what I had to hand.