I have to admit, Anna, I had to look this one up. Officially it is St. Catherine of Bologna. Her feast day is March 9th.
I think she was named the patron saint of art because she painted the many glorious visions she saw. She also drew lovely pictures that were contained in manuscripts.
She lived a very private and simple life. She died when she was 49. Eighteen days after her death, the people reported a beautiful fragrance around her grave. It was discovered that her body remained untouched. It is now housed in the Chapel of the Poor Clares in Bologna. You should get your dad to take you there. Get some spaghetti while you are there.
A great way to honor St. Catherine would be to have an exhibit of your art on her feast day. You could have some fun party foods and celebrate the gift of art in your life.