There are SO MANY of designers I love!
I'll start with just two: Royston Cooper and Eric Ravillious. This picture is By Royston Cooper. I love it because it just makes you smile.
It's simple, direct and lovely. Royston Cooper was born in 1931 and produced a lot of really fantastic, joyful posters in London in the 1960's. They have a freshness that you don't see so much now. There's very little written about him, but you can learn a little bit more at