Here's an idea that could not be easier but is a good way to draw attention to something as simple as a bath sale promotion while remaining brand appropriate. Restoration Hardware uses jute rope in stores as a prop. Here they string it up in the window as a clothesline and then hang a row of towels spelling out 'bath sale'. They hang the towels with metal clips again in keeping with brand.
Proving once again - Simple ideas done right work every time!