How do you get the cool headers that you can put your stuff in. I know, I can't explain it properly.

Here's an example:

http://neopets.com/guilds/guild.phtml?id=2193210

Sorry i can see that the link doesn't work. Here's one that's similar.

http://neopets.com/guilds/guild.phtml?id=2183966

Look in the blog headers.