Beautiful Widgets is not a skinning program, it provides widgets including a clock that looks like the one you've pictured, even though I think the one in your picture is the stock HTC Sense flip-clock.
Usually custom icons are released in the market as Theme Packs for 3rd party launchers such as GDE, SweeterHome, aHome, Home++.
Alternatively, they can part of a theme for a custom ROM.
Good Luck,
Mike