Pastel goth (sometimes referred to as "creepy cute") is a fashion oriented style often associated with Japanese street styles and nu goth. It's a blend of dark themes and iconography (e.g. monsters, blood, gore etc.) with cute and almost childish themes such as bows, candy and of course the sweet pastel colors. There are many key elements from other styles that carry over into this one i.e. lolita style doll makeup and decora style accessories.
The style has been the source of much debate and has received some flak from the overarching "goth community" as wrongly applying the goth label to a fashion. Pastel goth popularity has died down in the recent years however the same elements of creepy icons and pastel colors are still carried over into mainstream fashion.
Mix the creepy with the cute, there's no reason your pink bow can't have fake blood dripping down it.You can even wear jewelry just let it express the cute but creepy feeling like a dinosaur or maybe some skulls.