Signature Banners...Where to get them.

I've seen some people on this thread that have some signature banners that I would like to have. I just wanted to know exactly where they got it from.

here's a rough Idea of what I'm talking about.



it looks somewhat like that, but it has different pictures and messages.

i've seen some that say...
PSP owner
PS3 owner
nintendo enthusiast
...etc, etc.

If there's a link where there's a bunch of these, please let me know.

thanks in advance! ^_^