So I followed the tutorial in this question answer and created a "bootable" USB from my OS X snow leopard '.dmg' installation media. The problem is that my Clover EFI bootloader doesn't seem to recognize the usb as bootable (and doesn't even add it in the boot devices menu). I don't know if that could have anything to do with the fact that I've rEFInd as my primary bootloader and so Clover EFI is chain-loaded.
Any ideas how to boot this usb? Maybe use different bootloader?