Shea has his own surfboard business at home in the States, where he is chief designer.
The 6ft 3ins United States international said: "I like to paint two or three times a week.
"If you look at my paintings you will see a lot of them are bold, bright and unpredictable.
"And I play my football in pretty much the same way - so there is a comparison.
"I don't know what I'm going to do out on the pitch. I just like to go out there and it happens - that is exactly the same with my paintings.
"I play my best when I don't think about things and just do things on the spur of the moment. I am a free spirit, I suppose."