If you're looking for a dynamic approach, our notices plus Add-on will allow you to include templates into notices, effectively enabling you to use XenForo template syntax.
I have a menu item and notice which has a link to allow the use to choose their country customisation. I want it to "auto-save" which only seems to happen when I have the t=bla in.
Might there be a better way to allow someone to select their style? (other than the select-style in the footer )