The main overview for creating/downloading images NOT in the templates is:

lxc-create -n container_name -t container_template -- -r distro_release -a distro_architercture

An example CentOS6 is:

# lxc-create -n CentOS6 -t download -- -d centos -r 6 -a amd64

Example CentOS7:

# lxc-create -n CentOS7 -t download -- -d centos -r 7 -a amd64

Example Ubuntu 14.04LTS:

# lxc-create -n Ubuntu-14.04LTS -t ubuntu -- -r trusty -a amd64

Example Ubutu 16.04 LTS:

# lxc-create -n Ubuntu-16.04LTS -t ubuntu -- -r xenial -a amd64

Most of these containers are completely blank/fresh images.
These images do not have basic commands like 'ls' and 'cat'. To export your local path, simply run the following command:

tee -a ~/.bashrc <<EOF
export PATH=$PATH:/sbin:/bin
EOF

source ~/.bashrc