Likewise, highlight macros in C and make them different to variables/functions.
You can see here that the Monokai theme supports about 20 tokens and doesn't differentiate much between scopes: https://tmtheme-editor.herokuapp.com/#!/editor/theme/Monokai
Personally, I prefer highlighters that do something to highlight variables differently, like this variant of Monokai (ie around line 45 for the JS example): https://tmtheme-editor.herokuapp.com/#!/editor/theme/Monokai...
What you are describing sounds like regular syntax highlighting to me. This is my current theme: http://imgur.com/a/cQbWL You can see the level of customization available fits with what you described.
And it has really helped many times in the past, preventing all sorts of silly mistakes that could have been hell to debug. Like shadowing a variable :)