[Feature Request] option to disable background images in "now playing" mode

[webpostkastl]

I'm submitting a...

[ ] Regression 
[ ] Bug report  
[ x ] Feature request

I'm not a huge friend of half-transparent background images. I think it would look a lot better and more stylishly without. I'd rather have an option to either turn the background image off completely or having a way to customize the opacity - e.g. with a slider from 0 to 100

current background-situation:

without background image:

instead maybe with a bigger album cover to let it shine: