Suggestions for flowers for sacred kitty space?

We buried our beloved perfect kitty in a special covered area in our yard, protected from the elements with filtered sunlight. Can you suggest flowers and other plants for pots in this sacred space? We have gaillardia, calendula, keys of heaven, catnip, mums, and gerbera daisies. He didn't care about flowers, but we want to beautify his resting place as much as possible. Thank you!