The banner is 940 pixels by 200 pixels. It's saved as a .png. You're free to use it as long as you save it to your own image host! If you try to hotlink this one, you'll just get an ugly blinking icon instead, so host it in photobucket or something. You can see it in action on my vox account.
There's plenty of Pickles icons to go with this too. ^_^