This isn’t precisely goth, but it’s such a brilliant idea that I have no choice but to share it. Over at She Knows there’s a splendid tutorial for making a mailable slice of cake.

It’s a wonderful trompe-l’oeil whose main ingredients are a sponge and some caulk. The result is apparently quite durable and is certainly a memorable way to send a postcard. There’s a related pumpkin pie postcard tutorial which could also be repurposed as a cheesecake.

Either of these would be a really unique party or wedding invitation. You could up the Goth Quotient a little by making the cake “red velvet” with black icing; since caulk is usually available in only a few colors you could either carefully tape the “cake” and paint the “icing” after it’s applied and dried or custom-color it before application.

If you aren’t feeling up to making these yourself, there’s an Etsy shop which sells them pre-made. A bit pricey if you want to send a lot of them, but reasonable for a one-off where you really want to make a splash.