These skins include very famous towers like Big Ben.
Spb Time is the best-selling time application for Pocket PC on both PocketGear and Handango. One of unique Spb Time features is that it can work as a screen saver when Pocket PC is in a cradle while connected to external power. The average PDA spends a considerable amount of time (about 50%) in a cradle while connected to external power and Spb Time allows you to customize the screen saver behavior.
All Spb Time skins are free and can be downloaded from: http://www.spbsoftwarehouse.com/products/time/skins.html
About Spb Software House
Spb Software House is a software development company, specializing mainly in Pocket PC software. Founded in 1999, the company offers advanced software solutions for use in a wide range of applications.
Be sure to checkout my review of SPB Time