MediaWiki is a free application and Wikipedia is running using this application. I list out the mediawiki skins and free mediawiki skins. It will helpful to change your mediawiki themes. Also You can download the mediawiki skin using "Download" link and also demo page link.
Skin: Fratman
Fratman skin developed by Jason Pearce.
Skin: Erudite
Erudite mediawiki skin is very clean and look great.
Skin: Cavendish
Cavendish style by Gabriel Wicke.
Skin: BlueSpice
BlueSpice is a free mediawiki skin
Skin: Clean and Blue
Clean and Blue is a free mediawiki template
Skin: BookJive
BookJive is a free mediawiki template
Skin: Paulgu
Paulgu is a free mediawiki template
Skin: Tech
Skin: Dusk
Skin: SnapHouston
Skin: Drupal
Skin: Enhanced Relief
Skin: MistyLook
Skin: RoundedBlue
Skin: VbGore
Skin: Cheops
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Lee Miller
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John