Stencils matching ‘cloud’
Basic Cisco Icons
Falk Stern took a set of the basic Cisco router and switch icons for Visio and created a handy OmniGraffle stencil set out of them. Firewalls, routers, switches and even the ubiquitous internet cloud are all available.
Basic shapes (curly brace, clouds, block arrows)
I have imported a few shapes from Visio into OmniGraffle and created a stencil of them. It contains a curly brace, a number of cloud shapes, and a number of block arrows.
Cisco CVD 2014 LAN Switching Icons and Clouds
Cisco released updated CVD Icons in many formats, but of course, no Omnigraffle stencil. These are built from the PNGs. http://www.cisco.com/c/en/us/solutions/enterprise/design-zone-smart-business-architecture/cvd.html This is the LAN Switching Icons and Clouds section.
CTERA Networks
CTERA Networks CloudPlug, C200, C400, & Portal.
Formal Network Symbols
This is an excellent stencil set of formal network symbols, for when the poofy internet cloud simply isn't enough. Oh wait — the poofy internet cloud is still there, hiding behind the moniker of "Network Cloud". That seems formal, maybe not black tie, but pretty formal.
Google Compute Platform
This stencil contains icons for Google Compute created from: https://cloud.google.com/icons/
Iron.io Stencils
Stencils for the Iron.io Cloud Services
Juniper QFX10000 Switch
The QFX10000 line of industry-leading switches offers a highly scalable, high-density network foundation for supporting today’s most demanding data center and cloud environments, including midsize to large data centers, private clouds, and public clouds.
Microsoft Azure
This is a Stencil for Microsoft Azure Cloud Platform based on icons shared by on David Pallmann. Hope this helps someone. http://davidpallmann.blogspot.ca/2011/09/windows-azure-design-pattern-icons.html