Whilst I'm flattered you used my theme as a "good" example, I have to ask, did you try the Singularity before deciding it was a "bad" example? If you try it I think you will find the this theme is not as intrusive as you might think. Singularity is a good example of how a flashy design can still be very useful.

As for the winamp skin, I think this skin is very appealing it will look great on my MP3 machine that sits in the lounge room, plugged into my home stereo. Since this PC serves no other purpose it will be nice to have a skin that fills the screen with features.

So my point is that whilst you might look at these skins and themes and decide that they would never be useful for you, it certainly doesn't mean they are "bad".