Material You colours (Wallpapers only)

Is your feature request related to a problem? Please describe.

Describe the solution you’d like
While Anytype shouldn’t prioritise design and should definitely focus on function, I think a simple material you based wallpaper theming system would be nice to have and wouldn’t be too difficult for those that know what they’re doing.

Describe alternatives you’ve considered
All of anytype being material you-ified, but Anytype’s UI is already nice, so just the wallpapers matching material you colours would be a nice middle ground.

Additional context
Material YOU colours, not necessarily the design language