New Song Idea Blooming

I have some new lyrics in search of a song... which hasn't happened in quite awhile. The open line would be:

Is there anything that you can do
To turn a white hydrangea blue?

I imagine a young man saying it to the flower specialist behind the counter. Her answer is something like:

Tell you something, it never fails
Bury it with some rusty nails

Where it goes from there, I have no idea. But somehow the whole conversation about turning a white hydrangea blue has to be both a metaphor and the subtext for a tension between them.