Themes

Hello Kitty Icons
Mindy Weaver(Free)
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Hello Kitty Icons: A Collection of Icons for Hello Kitty Fans
ClarusX
Interealm(Trial version)
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Customize OS X Page Setup Icons with ClarusX
Hue Party for Philips Hue
SpaceNation Inc. CA(Free)
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Free Software Application to Customize Home Lighting Systems
Halloween Avatars
Deviantart(Free)
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30 Scary Halloween Avatars
Nocturne
Blacktree(Free)
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A free app for Mac, by Blacktree.
Christmas Dock Icons
Chicho21net(Free)
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Decorate your Dock with Christmas cheer
WindowShade
Unsanity(Trial version)
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Take control of window management in OS X
Img2icns
Shinyfrog(Free)
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Img2icns: Convert images into icons