Yup. You can request signatures, avatars, and all that jazz here. Pretty much anyone who makes stuff can do the request unless you want a specific user to do it. Here's an easy to follow copy/pastable format:
Type: Signature
Size: 000x000
Image: link goes here
Text: name and stuff
Subtext(Optional): other stuff
Other details: style, look, etc.
Aaaaand that's that!
Type: Signature
Size: 000x000
Image: link goes here
Text: name and stuff
Subtext(Optional): other stuff
Other details: style, look, etc.
Aaaaand that's that!