Grain edit is one of my favorite design blogs. They focus on design from the 50s-70s and work that is inspired from that era. Among other things, they feature interviews and studio visits with top notch designers and illustrators.
I have always respected the work of visual masters such as Milton Glaser, Paul Rand, and Herb Lubalin, so it’s no surprise that this is one of my favorite sources for inspiration. Take a look at some of the work/articles posted by clicking the sample images below.