When many people hear of gothic home decor they picture someone that only dresses in black and wears black lipstick. The reality of the matter is that many people are interested in this decorating style and most of them look just everyone else.
Many times, gothic home decor is used in one room of the house rather than the entire house. The basement, family room, and bedrooms are popular for this style of decorating. You don't have to consider yourself gothic to enjoy this type of home decorating.
When planning your goth room you will probably want to address the walls before anything else. One option for the walls would be to get some plastic or vinyl imitation stone siding that people put on the exterior walls of the homes and line your interior room with it. Some of these materials look very real. Another option would be to paint the walls. Black, really, makes the room seem confined so if you don't want that, try a darker red, navy, or silver. These colors will work well with your furnishings, also.
Your furniture and flooring allow you to use your imagination again. Wood is a safe route to go with for both flooring and furniture. A hardwood floor works well and wooden furniture can be left as is or painted. Black paint on wood furniture will match any gothic decorating.
There is a wide variety of accessories that you can choose from to complete your room. Older paintings of houses or people can be found in pawn shops or on garage sales. Candles are a nice addition. Red, black, and silver candles are very inexpensive. Let them burn down some for an added touch. Place smaller candles in metallic candle holders. You can use things covered in silk or velvet for accenting certain areas. Dry flower arrangements are quite gothic or add some knives and swords for a medieval goth feel.