Adjust home screen brightness of icons and background

So now that 5.1 on gen2 hardware is jail broken,
how do we fix the brightness and garish icons on the default “homescreen”.

Whoever designed this clearly didn’t watch tv in a darkened room.

I prefer the icon concept To the wordy, vertically-centred drop-down menus of old but the execution could be better.
I think by wading around in ssh, identifying the icon image files and modifying them would do the trick.
Has anyone tried doing that yet?