Signature help

[doubledude]

Hey guys !!

I'm not sure if this is the right place to ask this, but here goes :

I've always wanted a cool sig ( the picture or gif that appears below ones comment), so can someone tell me how to get/use one because I can't seem to figure it out :P.

Thanks in advance for those who help me

EDIT: Ok so here is the picture, I'd appreciate if someone can resize it to a normal sig size (no idea how big that is) and add some pretty stuff to it so it looks awesome ( stuff like on my avatar), do it how you think it's nice,
I'll + rep anyone who tries.

Image: