I don't have a link to one (though I'm sure there are plenty online), but you can quickly whip up a small image based on the cirros initrd to test your setup. E.g.:
mkdir foobar
cd foobar
gunzip -c <path>/cirros-0.3.0-x86_64-initrd | cpio -i
Make a copy of cirros-0.3.0-x86_64-blank.img (name it cirros-lxc.img or whatever), mount, and copy everything from foobar over. Once that's done, you can unmount, add that image to glance, and then launch (making sure to select that image). You can verify by checking the expected fs at the mount point at launch (e.g. /opt/stack/nova/instances/instance-#/rootfs).
Let me know if you hit issues and/or if it works for you.