Can these paths be mixed?

One thing to keep in mind since the original poster was asking specifically about Wicca is that Wicca is a religion with specific beliefs and practices and therefore requires working with both a God and a Goddess. If you are not working with both God and Goddess then what you are doing is not Wicca. One could call it Witchcraft rather than Wicca, or simply say it is your own personal spiritual path. And if it is a personal spiritual path then you are free to create any blending of beliefs and practices that you wish.