Alfons Maria Mucha

This was the most visually appealing to me.

Interest in Mucha's distinctive style experienced a strong revival in the 1960s (with a general interest in Art Nouveau) and is particularly evident in the psychedelic posters of Hapshash and the Coloured Coat, the collective name for two British artists, Michael English and Nigel Waymouth, who designed posters for groups such as Pink Floyd and The Incredible String Band.

This excerpt from Wikipedia made this artist much more relevant to me.