Creativity: What's the connection between a Teacher's attitude and children's work?

I have a problem with creativity and I'm afraid it affects how I teach. I'm not sure when it started, but I think it has to do with feeling like my creative efforts as a child weren't perfect enough. I am a perfectionist and I was raised by a perfectionist and anything less than perfection wasn't acceptable. I also have a problem with not knowing how to assess creativity or creative projects. And that brings me to the problem of control.  Maybe I'm just afraid to let my students do anything which I can't control and mark either wrong or right....

And yet, I know that I'm being too hard on myself. I don't think any of my students last year would say that I didn't let them be creative. I did drawing in front of my class (with apologies to them, of course, of my lack of perfection) and tried to strongly affirm them in their creative efforts. 

So...how can I go about conquering this and truly teaching with and for creativity?? Any suggestions?