Unfortunately I don't have any strong example hehe It seems to me that they didn't survive test of time ( or me for that matter ). But, Wayne England use that a lot. Washes of Indian ink or similar so that it's almost brownish and then with white very strongly. I did few drawings with rapidograph and then with white ink over few things ( wash like, few times over and over, sometimes with thin brush or dip pen ) that were to dark or something then back with rapidograph doing little details or something.
Must say, mixed media is the best ( very simple sentence hehe ). I did try many techniques and not on one sheet of paper but on many and I always find that one technique alone ( like only graphite pencil or only rapidograph or only gouache,... ) is pretty boring and got borders that you cannot pass because of the limit of technique itself. There are techniques that are versatile in sense what you can do with them and how "free spirited" they are ( like acrylics, you can go over and over and over, splash, stain, wash, details or heavy strokes compared to graphite pencil that is very "narrow minded" and once you fill that certain space, there's no going back ). I did lot of pencil drawings and it was always the same frustration since I did most of my work from head.
So, to me mixed media is most interesting. You could draw with wax pencils then go over with markers ( like Copic or ProMarker ) then with rapidograph ( that sort ), then acrylics or something, even glue piece of paper with drawing if you didn't like what you've got on that part of drawing or back with wax or soft pastel pencils or even gesso that you can go over again. Scrap the surface for texture or similar. I used to stab paintings ( talking about frustration ) with handle of a brush if I didn't like it. After few days of over painting and stabbing I usually destroy whole canvas ( I think I don't have any stabbed canvases hehe ).
I think you should try it. Even with worst quality art supplies you can see what mixed media can do for your art. It doesn't have to be in colour you know, black and white mixed media is also quite interesting and without boundaries, that's for sure.
Yes, when mind changes so does the hand. There are drawings of mine that I couldn't do today, not that they're any good, but my mind and hand are so different then 20 years ago. Of course, what I look at drawings today I wouldn't even think about that 20 years ago.