I use the Delphi IDE Theme Editor to apply the base colour scheme, which was green-apache. Then I went about making the system greener as far as backgrounds, choosing in most cases to make the background a shade of green enough different that your eye could spot the difference while still maintaining the whole GREEN is good for the eyes sort of thing. I also made the default font 14pt because, as a senior citizen, BIGGER is better. As mentioned, Consolas is the choice of fonts. I like the ones and the slashed zeroes. Once you are finished playing with the editor, save your theme to a name of your choosing and then apply your master work. As mentioned, I like the background, but there are days where I go to a second theme that is darker green in the background with the slightly lighter background of this theme being swapped for it. Look at the enabled breakpoint line to get what I'm saying.
Again, I understand that this is not everybody's cup of tea. Some will have a preference for bold and non-bold. Yes, some will actually want italics in the comments just for familiarity's sake. But RRuz's work providing a quick library of starting points, allowing you to build up a set of themes for specific work ... I can see having a theme for debugging.
I forgot that I DID have to do some cleaning up IN Delphi. The comment block was that pinkish red ON A BLACK BACKGROUND. I THINK that was the only post-IDE Theme Editor change. The marked block was money green on navy blue. Yeah, those are the differences. Sorry about that. GM