So as not the stretch the boards, limit the sizes of your avatars and signatures with the sizes below:
Avatar: 100px by 100px
Signature: 550px by 250px
Notes:
[x] You can upload avatars smaller than 100x100px but it looks much in that size.
[x] The signature size stated is the maximum limit for signatures. You use anything smaller than the stated size.
[x] Never ever forget to credit whoever made your signature or wherever you got it from.