"To gild the lily" means to add unnecessary embellishment or decoration to something that is already beautiful or impressive. It implies that such additional enhancement is excessive and unnecessary. Full definition
The SE gilded the lily with leather seats, a more powerful engine (140 horsepower against the EX's 130) and antilock brakes, which were a first for the Accord. (edmunds.com)
If man comes to have godlike powers, then his calling is to exercise the same regard for the goodness of all things, as does God, who numbers the hairs of our heads, takes note of every sparrow that falls, and gilds the lilies of the field. (religion-online.org)
Doing anything other than eating in - season blueberries out of hand seems like gilding the lily. (vegkitchen.com)