I am trying to build an RPM that ships .desktop files to run bitcoin-qt in testnet and regtest modes, respectively. This requires color shifted pixmaps to get the green/blue logos for testnet and regtest, respectively. These pixmaps are used by GNOME, KDE, and other Linux WMs to provide an actual application launcher icon.
This PR includes the pixmaps I generated, as well as the script I used to create the pixmaps. The script requires the convert command provided by GraphicsMagick. I think it makes sense to check these assets in for ease of distribution.