I love having a dark themed interface, and the "Substance Graphite Aqua" is kinda awesome. I have two points in the post a question and an idea.
a) Is there anyway to change the background of the line numbers panel? It sticks out like a sore thumb on contrasted to the dark grey of the rest of the UI. Under Options > Gutter there is a "Color" option with a box, however this only affects font colour for the line numbers. A background colour option would be nice to have here too. Apologies if I'm being blind about this.
b) An idea: have the LaF selection for the main UI also affect the editor. I understand that this may be complicated given that they are separate components, however imo it's a nice touch. It's kinda awkward to have a massive white square in the middle of my screen. I have no problem with manually changing the colours - I'd have done it anyway - but I know people that would just be like O_o and become confused. It's not a massive problem though.