Apologies for the belated reply. F1 gives you a list of options.
There's a night mode you can switch to with F5, but you can currently not set the background color separately.
You can edit most of the colors in the color section of the script. It looks something like this:
Code:
elseif colorScheme == "dark" then
colors.textcolor = {148/256, 148/256, 148/256, 1}
colors.linecolor = {46/256, 46/256, 46/256, 1}
colors.linecolor2 = {.1, .1, .1, 0.6}
colors.windowbackground = {18/256, 18/256, 18/256, 1}
colors.buttonbg = { 0.1, 0.1, 0.1, .7 }
colors.buttonfg = { 0.3, 0.9, 0.4, 1.0 }
colors.connector = { .4, .4, .4, 0.8 }
colors.wireColor = { .65, .65, .65, 0.95 }
colors.muteColor = { 0.9, 0.3, 0.4, 1.0 }
colors.inactiveColor = { .6, .6, .6, 1.0 }
colors.signalColor = {37/256,111/256,222/256, 1.0}
colors.selectionColor = {.2, 0.2, .5, 1}
colors.selectionColor = {.4, 0.2, .8, 1}
colors.renameColor = { 0.6, 0.3, 0.5, 1.0 }
colors.playColor = {0.3, 1.0, 0.4, 1.0}
colors.gridColor = {0.35, 0.25, 0.53, 0.3}
colors.selectionColor = {.2, .9, .5, 1}
The background one is called windowbackground.
If you come up with a cool new color scheme, I wouldn't mind adding it to the plugin as an option.