Here is a zip of all the Icons extracted from the SDK dump, in three different sizes. XHDPI has some missing as they weren't available in the apps, I am not sure if these are different to honeycomb but I though I would post anyways.
No it can't be flashed, just a collection of PNG's. I am working on creating an ICS theme using the resources from the system dump, and part of that involved pulling out the icons so I thought I'd share them.
For anyone that is interested, the ICS blue is the following: