Just as the tittle suggests.
This thread has been in most forums I have seen when I am looking at them so I thought I would bring it here.
For example for me
10/10 awesome avatar is is very stylish
10/10 awesomer sig it is the best thing I have seen in years
obviously I am biased.
EDIT (also a good place to get advice on possible sigs and avatars to test them out.