Have you read the geekhack TOS lately?
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Right here.
And for a cheaper alternative: http://www.ebay.com/itm/Custom-colorful-PBT-key-caps-for-any-MX-Cherry-Switches-Mechanical-keyboard-CS/290740558997?ssPageName=WDVW&rd=1&ih=019&category=33963&cmd=ViewItem