Many of you might be aware that UCCW (Ultimate custom clock widget) is one of the most popular and highly customizable android personalization app available on play store. You can create your own skin using the app and it also allows you to export as .uzip or .apk for sharing purpose. These also means that you can import custom skins on your device.
Here i have posted couple of clock skins that i had made in the past. You can download them at the link below and use on your android.
Minimal Clock
StuffsDroid 