Remote X window execution of mal4s - secure411dotorg/mal4s GitHub Wiki
For those who aren't ready to install mal4s, there may be an alternative. However this is expected to be a degraded experience in terms of frames per second of viewing.
http://aws-musings.com/4-easy-steps-to-enable-remote-desktop-on-your-ubuntu-ec2-instance/
http://www.idevelopment.info/data/AWS/AWS_Tips/AWS_Management/AWS_12.shtml
https://www.nomachine.com/download
http://blog.restbackup.com/2011/01/how-to-use-amazon-ec2-as-your-desktop.html