When Charlie Kratzer started on the basement art project in his south Lexington home, he was surrounded by walls painted a classic cream. Ten dollars of Magic Marker and Sharpie later, the place was black and cream and drawn all over.

There are fictional detectives Hercule Poirot and Sherlock Holmes, Winston Churchill lounging with George Bernard Shaw — and the TV squirrel Rocky and his less adroit moose pal Bullwinkle.