The PC version of the wallet is monochrome, and the frames are not showing. The Wallet on Unix is the one looking best with the blue icons.
I have fixed these problems while working on the Kryptofranc, and I would like to update Bitcoin to be consistant across the desktop versions.
Here is what the PC wallet is looking right now.

And that's how it will look after.

(sorry for the KYF stuff, the only changes are the frame and the icons)
The modifications are minimum. /src/qt/forms/overviewpage.ui Has to be modified so that the frames are visible not only on Unix.
Otherwise it is just a pre-colored set of icons. They are compatible with the ones used today, that means that my tests are not showing a noticeable difference on Unix and MAC
The new icons are replacing all the current monochrome PNG icons located here: /src/qt/res/icons/
Windows though which is the most used version is in my opinion much better.
Let me know if you want that I push these to master.

