Loving the suggestions so far, here's at least some ideas from my noggin and general suggestions based off what people have said;

- Sopour Pie (but better)

- Grub-related food (I'm thinking like purple eclaires with like green pastry cream?)

- Totally-not-Betty-Crocker-Cake-with-not-Betty-Crocker-Frosting

- Pumpkin Pie/Pumpkin Loaf

- (Edible) Uranium

- Blue Apple (probably a cake)

- Any of the troll snacks/ background food from Homestuck

- Something Candy Corn related (cupcakes?)

- The black slime from the imps (goop)

- Homemade Faygo (or faygo mocktail)

- Rose's Mom's Cocktail (straight vodka)

- Homemade Fruit Gushers