Currently, the icons in the BitCoin wallet stick out like sore thumbs on the vast majority of Linux desktops. (Probably looking the least out of place on KDE-based desktops, given the design aesthetic.)

The QIcon initializers in BitcoinGUI::createActions() in src/qt/bitcoingui.cpp should be changed to use QIcon::fromTheme instead.

Also, the icons in :/icons/ should be renamed to match the XDG icon-naming spec so the fallback behaviour is preserved without needing to provide the optional second parameter to fromTheme.

For example:

• QIcon(":/icons/filesave") should become QIcon::fromTheme("document-save")
• QIcon(":/icons/quit") should become QIcon::fromTheme("application-exit")
• QIcon(":/icons/address-book") should become QIcon::fromTheme("x-office-address-book")
• document-properties would be a good standard replacement for :/icons/options
• You can get away with using go-next and go-down to replace :/icons/send and :/icons/receiving_addresses

Ideally, you'll want to install any icons not covered by the icon-naming spec in the appropriate size and category subfolders of the fallback theme at $PREFIX/share/icons/hicolor/ where it's easy for theme authors to look up the names to override.

Here's all the relevant documentation:

• QIcon:fromTheme
• QIcon:themeSearchPaths (Icon lookup semantics)
• Installing icons to the system fallback theme
• Standardized icon names