I recently ran into
netboot.xyz and, being sad that it didn't support my favorite live distribution filed a
feature request. I got an old image I had lying around to boot (specifically, grml64-small_2013.09.iso), but I couldn't get grml64-small_2014.11.iso
to boot.
When I try (testing in VirtualBox), the startup complains "modprobe: module dm-raid45 not found in modules.dep" and about module "echi-orion" and gets stuck at an initramfs prompt with the message "Unable to find a medium containing a live file system".