Step one: use hall bathroom instead of master bathroom, notice that Builder Beige switchplate is horrid with lovely new purple walls. Take it down and wash it thoroughly.
Step two: dig out stash of old seed catalogues saved for this purpose. Get super crabby because you can't find the Mod Podge anywhere. Give up, then have daughter find it immediately, in the "glue box" you forgot you created.
Step three: decide on a color scheme, and start cutting. I asked @phantomtheraccoon if we should coordinate or contrast and she cleverly said both.
Step four: collect your flowers and fiddle with layout.
Step five: paint item with Mod Podge, place your images, and paint them again. Leave to dry, which honestly doesn't take long.
Step six: trim edges add cut out holes. I didn't actually cut out the screw holes; I just cut little X's there for the screws to go through. Worked fine to put it up, we'll see someday how it survives taking it apart again.
Step seven: coat everything with Mod Podge at least one more time, paying special attention to edges. Dry elevated on something (say, the top of the Mod Podge bottle) so it doesn't stick down.
Step eight: okay, wow, that's awesomer than expected!