More personalisation of app appearance

I would really appreciate being able to make Structured more aesthetically pleasing to use. Sure, I can set a "main app colour", but that's about it for now. I would like to be able to set a background image or colour, decide the colour of the top bar, etc. The more customisable the better.

Right now I gravitate more towards Jorte or Amazing Marvin although I would prefer to use Structured, simply because of this lack of personalisation and colour coding of tasks/categories.

If it was implemented I would gladly switch over 100% and pay for premium.