Yup! Sometimes more than others, but I always put some effort into my avatar/signature in some way shape or form. Either it's making the banner or image that goes into the signature, the avatar, the CSS, the text, and so on and so forth. This current one that I have took quite a bit of time, most specifically with the image and the text.
Of course, I do have times when I just toss things together quickly or just use an older style and edit it, but that's what happens when I'm being in decisive and I don't have a set theme to keep for a while.