I did a pro bono job for a local community group recently and I afforded myself the luxury of illustrating with brush and ink, the old fashioned way! As much as I admire fine brush work (I'm a great fan of the loose lines of Bill Watterson) I've never really used it in my own work either because of deadlines or a fear of it looking shit.
Well I did it for this job and I had a ball! I think the results are okay and I really impressed myself with how natural the lines look and the little nuances that the brush gives the line weight. I used barely thinned india ink and an old rigging brush that I had lying around.