Unless you are born blind, you are influenced by everything you see.
I say, look at everything, you never know where an idea is going to come from. I feel there is a difference between being influenced by someone and copying someone. It just takes time.
Funny, I just spent the day at Greenfield Village. I was taking lots of pictures and I saw these fence posts. They had a criss cross shape going down the fence line. I grabbed the camera and then realized how many times I've seen this shot. After thinking whether I could create a new image of this, I ended up putting the camera back down. I just couldn't see a new way of making that shot. I'd like to think I didn't give up, but I just passed on it, and started looking somewhere else.