Some applications need fancy things like rounded (or other exotic format) buttons, [LED]s that glow, 
and other full graphical widgets, that are difficult to emulate with the regular [Tk] widgets. 
Think of Winamp(TM) or other mpeg3 sound players.
Here is my try on that: A customizable set of widgets drawn on a canvas. 
Its behaviour is very primitive yet, but enough for my needs. 
I used it in my VebKlaso Player, http://vebklaso.com , 
a online synchronized audio presentation system. There is a pdf User's Manual at the site. 

Read more about it at http://pragana.net/skin.html.
You may download the package at http://pragana.net/Skin-0.1.tar.gz. 
Save it and read the short README file enclosed.
Here are a couple screenshots of the player with custom interface:

[http://pragana.net/images/vkplayer1-small.jpg]
[http://pragana.net/images/vkplayer2-small.jpg]

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[Category GUI]