If I could, I would probably change the layout to my blogs every time I log on. I love playing with them, and wish I had the skill to design my own rather than rely on editing the ones blogger offers. Instead, I update them once every few months. Of course, when each of the blogs first started out, I changed them more frequently since I was still trying to find out what worked best.
Like I said, I get my layouts and backgrounds from blogger, with a few changes. I don't change much about very often because I think consistency works best when trying to create a brand. However, I did let myself get a little out of hand with the widgets.
Do you agree? How often do you change your layout and for what reasons? Where do you get the templates and such? Anyone skilled at designing them themselves? And while we're on the topic, what are your favorite widgets?