I started redoing the icons for the AD UI a while back, converting them all into outline, monochrome icons... This was back when AD didn't have multiple dartboards, so all icons are grouped and arranged by layers... I would export them and then replace the icons inside the app wrapper, I believe it was in resources. But I wasn't able to change the color of the background and highlight colors... I would love it if Affinity referenced an external AD file for all UI elements and allowed those of us who want a customize it to have a go at it... Those who want the defaults could stay safely there...   AD Beta - monochrome UI icons.zip   Great examples of a very simple solution, Alex...        Another simple solution. Very nice and clean UI.