If you like Yellow Box Jello, flip flop you are going to fall in love with Yellow Box Custard flip flop! Yellow Box Custard flip flop is the dressier version of Yellow Box Jello with its 1 ¾" triple layer Eva heel and ¾" platform. Yellow Box Custard flip flop has a thong that is encrusted with two rows of rhinestones and a flower in the middle. Yellow Box Custard comes in black, brown, navy, white or grey.