Since the right side is pale yellow and the bottom is green, why not try and match the left border to the right and top border to the bottom. That way you will have yellow / green all around.
Then, if you want, you could sew in a fushia piping strip and a light brown inch border.
Just a suggestion.
edit:
I just looked at it again and absolutely love it. Instead of the light brown border, how about a light blue/white mix to match the insides of the fairy blocks...it would look like clouds in the sky...