I never heard this before, but to use the native KDE theme for skype, simply open with as
Code:
skype --disable-cleanlooks
Woohoo... my buttons now glow in all their Oxygen goooooeiness.

via:
http://share.skype.com/sites/linux/

Question: Doesn't skype use qt4? It doesn't look like my KDE desktop.

There's a default cleanlooks theme used in skype. To make it look like your distro's style dictates use --disable-cleanlooks command line option.