"Pastel Goth" or "Creepy Cute" is a relatively new gothic substyle rising in polularity at an incredible rate. The basics of this style involve typical gothic elements (dark eyeliner, dyed hair, studded collars, ripped fishnet tights), clashing with cute childish elements (cartoon t-shirts and pink glittery hair accessories). The point is to juxtapose the harsh, dark elements, with the cute soft elements to create a kind of visual paradox of innocence and corruption all at once.
Think baby pink hair with black lipstick and/or those popular eyeball or bone shaped hairclips from Kreepsville. (http://www.kreepsville666.com/)