We went to Disney World around this time last year, so it's been on my brain, I guess.
What I did:
Opened in GIMP
Inverted colors and colorized to a pink (in honor of my 4 yo daughter!)
Increased canvas size
Duplicated layer twice and scaled each new layer by 50%
Moved scaled layers to appropriate places and added a layer mask to each
Masked out lower portion of the circles on "ears" and applied the mask
Created a new layer with black color and moved to lowest layer position
Tried my darnedest to add color or more stars to the black layer and discovered that I liked the plain black better...decided I was done!