Just to pique your curiosity, Microsoft has posted new themes, wallpapers, ringtones and more at the (they hope) irresistible location of
windowsmobile.com/coolstuff. Microsoft gets pretty literal with the site, actually, given that Cold Mountain is just one of a couple of themes that includes a snow-capped peak.
To select one of the themes for your smartphone, open the site on your device. Then, click Download, say yes to opening the file and when it's downloaded, your phone should open your Settings, where you'll see the new file and you can select it to activate the new theme. Microsoft gives you one free download without registering. If you agree to join their Owner's Circle, there's more opportunity for free stuff-you might even find some of it is cool.