What does goth smell like? Cloves, perhaps? For a spicy cinnamon and cloves aroma, put some cinnamon sticks and whole cloves in a pot of water and simmer on the stove. The fragrance is yummy, and it's a natural, authentic smell, not artificial. (Cinnamon can stain, so don't use your best pot. Pictured is my $2 thrift store pot that I use specifically for cinnamon and cloves.)
You can also make sachets to hang in closets. Cut a piece of tulle, put in some cloves and cinnamon sticks, and tie it with ribbon.
Spices at the grocery store are pricey. I strongly recommend ordering in bulk online. Even with the cost of shipping a two- or three-pound package, you will save a small fortune. I got 200 cinnamon sticks and a pound of cloves for about $25 from Monterey Bay Spice Company. Bought at a grocery store, that would cost about $350. Yes, $25 vs. $350. O.o