I have just published my first Boot to Root VM titled - Raven.
I assess this as being a easy to intermediate VM to complete. There are four flags in total to get and I designed it with two intended ways of getting to root.
I have also emailed the good people at Vulnhub and hopefully it will be featured there sometime soon. Until then you can Download the VM from my Google Drive.
If you complete it, please comment below to let me know what you thought!