Maybe I'm cracked, I dunno, but that legend about a "humility block" has always set wrong with me. I hope that it's only an old wives' tale. :)
To intentionally set a block in wrong would be a "false humility block," in my opinion, because what it says is that I have to set out to do something imperfectly because I'm so good that I will otherwise make something that's perfect. :shock:
Don't worry about the imperfections. Do whatever you do with a cheerful heart and your best effort and God will make it beautiful. :)