rainy afternoon happiness = whimsy and colour
You must check out the work of Miroslav Sasek - an amazing Czech illustrator that did the great "This is..." childrens book series. His whimsical illustrations are some of my most favourite of all mid-century illustrators. Also, having visited many of these cities, it is a wonderful way to remember them - even if I wasn't there in the 1960's.
If (or when) I find out that we are having a child, I will buy every book in this series.
This is.. on Wiki
His official website
And one more...