I used to change my signature like maybe 3 or 4 times a week. I like to mess around with making my own, but then @Xuchilbara made me this awesome signature that I'm using and I haven't changed it since. I think that was at least a month or two ago.
I've thought about changing it, but I think I'm too used to this one now.
I remember on other forums, I used to change my sig (and avatar) every few days because I was a HUGE Photoshop nerd. And I had to have ALL of the graphics on my computer match... that was back when I had so much free time and internet access, I didn't know what to do with it.