i can't say i followed any specific pattern, i simply did some measuring and went for it. i ruffled the polka dot fabric at the top before i attached it to the white strip. it adds a bit of femininity to a bathroom that could be fairly masculine due to it's color range.
this is a close-up of the bottom section. i can tell you that i was very meticulous in my measuring on this one, so it is definitely a camera trick that the white seems different heights!