I would have an idea regarding the icon packs, but I am not sure if it is implementable.
I am a big fan of the Whicons - Icon Pack by Randle and wonder if depending on the theme of the Ratio Launcher (Dark, Light, Focus) a different icon pack could be displayed, for example the Whicons in the dark and focus theme, Randles Zwart - Black Icon Pack in the light theme.
I think this could give a nice contrast. Or you could do it the other way round, of course
Looking forward to hearing more opinions (-: