Susan's comment on my post yesterday sent me searching.
I remembered having two Tiffany-style lamp shades somewhere.
While this one isn't the perfect shape,
it is a temporary solution..
...at least until I find the OTHER one (more blue and white).
I just can't remember where I put it,
and I can't remember where I purchased either one of them.
I'm positive it was a thrift store or garage sale though.