Recently, during an international gathering I attended, one canadian guy commented something about St. Francis of Assisi. He said that when people tried to judge his works they couldn't trace them to any previous source of inspiration like artists or writers that worked before him. He was unique in his own way. He was also considered as the forerunner of the Renaissance, which is no small thing. About his inspiration being found in God there is no need to talk.
Of course we are all influenced by the things around us and it's hard to say that someone is completely unique and that creates something which no one has seen before. That's not the point. I think that there is something when you just want to create to glorify God and you are free from the pressure to impress people. It's like the creativity (that comes from the Creator himself) can easily flow through you. I think it's a real challenge to spend time with God and let him be the primary source of our inspiration and not the opinions of others. True creativity is found in your real self, your real self that only God can reveal to you.