I just added support for changing breakpoint colors—you’ll find it in the Advanced highlighting section.
This is the nSolarized theme by Chris Nicola
I spent a bit of time getting it to change the circle and arrow colors too, but then I realised Visual Studio doesn’t actually support that. Whoops.
It looks like VS just uses bitmaps, which is why you get nasty aliasing effects around the circle when you use a darker color for the indicator margin.
It also means if you choose anything other than the default breakpoint maroon and yellow colors, it’s likely to look a bit strange. But hey, it’s there if you want to use it!