Some icons that all have a bluish tone and have been – and some still are – used on this web site
Download
You can 
download the icons in a handy package.
License
The icon set is licensed under a Creative Commons license. When using or redistributing please set a link to this page.
The icons are available in various sizes – but not every icon in every size:
96x96
48x48
32x32
24x24
16x16
