Well apart from the fact that the OSX EULA forbid the running of OSX on anything other than a Mac peice of hardware. there are a couple of technical hoops to jump through. these are documented else where (not on this site as it is unlawful). but you would still require a host operating system. for either Fusion or Workstation/Server to run the VMs. ESX would be unsuitable as it only allow remote access to the guests not interactive access at the console.
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Kind Regards
Tom,
Tom Howarth VCP / VCAP / vExpert
VMware Communities User Moderator
Blog: http://www.planetvm.net
Contributing author on VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment
Contributing author on VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410