Make your own widgets easily in a WYSIWYG (What-you-see-is-what-you-get) editor. Use custom layout, fonts, images, shapes, interesting objects like series clocks, weather information with icons, unread sms and gmail counts, battery information with bars and pie graphs, analog clocks, TASKER VARIABLES and more. Use hotspots to assign actions to widget. Does not require programming, editing xml files or rooting your phone. Share your creations easily either through uzip files or make apks and post on Google play. Or keep your unique widgets to yourself and tease others. (via Play Store)

This is the Play Store description. You can built your own widgets with this app, the community calls them skins. There is a german post liked beneth with more information, here you can find all tutorials, skins and weather icon sets summarized.