Just played a game on newgrounds and saw this 'dim' button which darkens the background and everything so you can focus on the game and not be distracted by ads, maybe you could put this on AG, and when the dim is on, everything apart from the game is disabled, so you can't accidentally click on ads or roll-over ads by hovering your mouse on them.
Nothing wrong with the colours, nothing too complicated is needed.
If anything, maybe be able to customise the primary background (on the edges), which is now blue, to whichever colour you want?