How do you universally change watermarks in a 'Seasonal design'

[Gary]

I would like to use Publisher's Seasonal newsletter design but I am hoping to
find a way to change the seasonal watermarks each season without manually
replacing them.

 

[JoAnn Paules]

That would be nice but I'm afraid that if you don't do it, no one else will.
(And when you do, send me a copy. <g, d, & r>)