In real life, I never change things up. My hair has been the same for years. I don't wear different styles on different days (but if I do, I feel a little more self-conscious about it). I eat the same things over and over. Familiarity is comfortable for me. Chalk it up to my OCD tendencies (self-imposed, self-prescribed).
But the blog wasn't feeling airy and open and light enough for me, so I changed it up. And I like it a lot!