If you don't mind being joined to Google at the hip, there's a great Linux-based cloud desktop operating system called Chrome OS. It's on Chromebooks. If, however you want a Linux-based cloud desktop ...
Peppermint 9, released June 22, accomplishes something most other Linux distros don’t: It melds the best components from other desktop environments and integrates them into a solid operating system.
The Peppermint operating system is built around a concept not found in most Linux distros. It is a hybrid combination of traditional Linux desktop applications and cloud-based infrastructure.