How to make chocolate cups with swirls?
You can try to make chocolate cups in general by "painting" a small dish/cup with chocolate, and letting it set in the fridge. If you want tempered chocolate, there are techniques for that.

But in any case, you've got to consider that different chocolates have different heating/cooling rates, so mixing chocolates with different fat contents (like milk vs dark), or from different manufacturers will (pardon the pun) fudge your calculations a bit as far as how hot/cool the chocolate needs to be. And white chocolate is an entirely different beast, so it has its own melting/setting points to consider as well.