In case you want to try out some things on OSX without doing it for real then being able to create a VM of OSX can be appealing.
Apple allow you to do this if you're runnning Apple hardware. The biggest challenge is finding a way to access the installer.
If you've upgraded to Mavericks already then you'll need to re-download the Mavericks installer from the App store.
Once you have this you can follow this Gist to create an iso file that you can boot to.
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| hdiutil attach /Applications/Install\ OS\ X\ Mavericks.app/Contents/SharedSupport/InstallESD.dmg | |
| cd /tmp | |
| hdiutil convert /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg -format UDRW -o /tmp/RWBase | |
| hdiutil convert -format UDSP -o /tmp/sparseRWBase RWBase.dmg | |
| rm /tmp/RWBase.dmg | |
| hdiutil resize -size 6g /tmp/sparseRWBase.sparseimage | |
| hdiutil attach -owners on /tmp/sparseRWBase.sparseimage -shadow | |
| sudo rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages | |
| sudo ditto /Volumes/OS\ X\ Install\ ESD/Packages /Volumes/OS\ X\ Base\ System/System/Installation/Packages | |
| hdiutil eject /Volumes/OS\ X\ Install\ ESD/ | |
| hdiutil eject /Volumes/OS\ X\ Base\ System/ | |
| sudo hdiutil makehybrid -iso -hfs /tmp/sparseRWBase.sparseimage -shadow /tmp/sparseRWBase.sparseimage.shadow -o ~/Desktop/OSX-10.9.iso | |
| rm /tmp/sparseRWBase.sparseimage.shadow | |
| rm /tmp/sparseRWBase.sparseimage |
The next step is just a case of pointing your VM software at this iso image and then booting from it.