May I ask how did you create your own avatar with animated lines(Current avatar of yours)? Did you made it with Photoshop or did you just simply requested it?
I figured out how the animated borders work, The first frame is just the background which has the initial start of the border, Then, an added one pixel of the color of the border is added to the front and a color of grey, the color underneath the border, is also moved up with the pixel, the grey covers up the other border frames under it, as a .gif lays the layers on top of another, otherwise, the border would appear to expand without that grey colored pixel covering up the last pixel of the previous frame.
You made it with Photoshop, right? I heard that Gimp can do the same too, but harder, is it?