Around the same time Fitzpatrick was producing a stream of psychedelic posters where the influences of Beardsley, Mucha and the West Coast artists like Rick Griffin, Stanley Mouse, Alton Kelley, Victor Moscoso and Wes Wilson were mixed with the influences of British poster artists Michael English and Martin Sharpe. The result was a veritable flood of images, mostly black and white, from the pen of Fitzpatrick which covered a multitude of surfaces; bus-sides to book covers, wall paintings to album covers. "This was one of the most exciting creative periods of my life. I was doing everything that I wanted to do creatively with my life. I made my reputation as an artist very rapidly and my work was all over the place. I even exhibited in London (at the very radical, chic Lisson gallery) and in Dublin at the very new and progressive Project Gallery. People like John Lennon and The Beatles, Led Zeppelin and actors like Peter Sellers who were into my work encouraged and commissioned it.

Slowly but surely the Celtic influence crept into my artwork. It's first manifestation was in a 'Two Bare Feet' poster, titled simply 'Love' and in 1972 I produced my first range of neo-celtic posters. These were picked up by Motif Editions in London and an american poster distributer and together with a new series of posters commissioned by Motif Editions achieved worldwide recognition for my work. Producing posters and album covers for Thin Lizzy did me no harm either and led to a huge number of commissions which paid the mortgage and kept me going".

In early 1977, Fitzpatrick was approached by artist Roger Dean to produce a series of works for a new publishing company that he had started called 'Dragons World/Paper Tiger'. "Roger Dean was one of my heros. He was one of the most influential artists of the Seventies thanks to his album covers for Yes and other bands of that era. His first book 'Views', published in 1977, is still today regarded as the bible of album cover and stage design and I always remember the buzz I got when my own album cover designs for 'Jailbreak" and 'Johnny the Fox' won Cover Design of the Year, ahead of Deans own magnificent designs for Yes and Greenslade. I still have many of his original album covers and posters in my own collection, so it was a real buzz when we met in London to sort out a publishing deal".