I made a new banner and changed my journal colours. Come over here and see ^_^
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It depends what layout you have, some let you add in a background image or a banner to the page, some don't.
You can edit the colours, images etc if you go to the LJ homepage, then go Journal > Journal Style > Customise Selected Theme.
If your LJ layout doesn't have an option to add in a banner, you can use the Custom CSS to put one in. There's a good tutorial for it here.