Could be anything. You're own drawing, creation, or took a nice picture and edited it yourself and made something out of it like an avatar, banner, signature, web design, wallpaper, etc.

I made someone an avatar and a signature with rotating images in-between from Type-Moon characters. Refresh page to see different ones:

Ava


Sig


And today I made couple of banners for my blog, Otakixus.





















I'm gonna go take a shower so I hope to see some works out there.

Hmm, here is some sign I did a few years ago. I pretty much stopped right now.













A sign using flash