Cut one long strip of cardboard about 36 inches tall and 6 inches wide for the post.
Cut four horizontal boards around 18x5 inches each. Shape the edges into jagged or pointed ends for a rustic, worn look. Then slightly tear or bend the edges for more realism.
Hot glue each horizontal plank onto the vertical post, spacing them evenly about 4 inches apart.
Mix brown and a touch of black paint to create a weathered wood tone. Use short, uneven brush strokes to mimic wood grain. Let it dry.
Paint eerie words like “CUIDADO COM… BRUXAS,” “VAMPIROS,” and “MONSTROS” (meaning “Beware of Witches, Vampires, and Monsters”) in bold black letters.
Smear a mix of watered-down black and red paint over the boards with your fingers or sponge to add dirt, blood splatters, and aging effects.
Outline the letters with a black marker for emphasis and let everything dry fully before displaying.