Slice a celery stick lengthwise into four quarters, then cut each piece into 1.5-2 inch sticks. Peel the clementines and gently insert a celery stick into the center of each, resembling pumpkin stems. Wrap them in clingfilm and place the clementine pumpkins in the refrigerator to chill until it's time to assemble your whimsical Halloween Snack Board.

In a small bowl, mix the icing sugar with cold water until you have a smooth, thick consistency. Transfer your icing into a piping bag and lay the sweet mini peppers on a plate with their flattest sides facing up. Squeeze two dots of icing onto each pepper for the sugar eyeballs, then chill them for about 10 minutes to set before adding the edible eyes.

Cut the cantaloupe melon in half, remove the seeds, and chop it into 1-inch cubes. Thread the cantaloupe pieces onto skewers, alternating with black grapes and marshmallows for a fun look. Melt the dark chocolate chips in the microwave, and fill a piping bag to draw spooky faces on the marshmallows. Let the chocolate set before placing the skewers on your Halloween Snack Board.

Using the white bread, assemble simple sandwiches filled with your choice of ham or cheese. Cut out ghost shapes using a cookie cutter for added fun. Store your spooky sandwiches in an airtight container to keep them fresh, and slice some black olives for chilling in a small bowl to add as garnishes on the board later.

Peel the bananas and cut off each end into 2.5-3 inch pieces to resemble ghosts. Melt the dark chocolate chips, and pour them into a piping bag. Carefully pipe ghost faces onto the banana pieces before allowing the chocolate to set at room temperature. Once done, set these spooky creations aside as part of your Halloween Snack Board.

Slice the apples into 1 cm thick pieces, spreading a generous layer of smooth peanut butter on one side of each slice. Place a few mini marshmallows on top as 'teeth' and press another slice on top, peanut butter side down, to create zombie mouths. These creepy treats are sure to add character to your Halloween Snack Board.

Take a large rectangular board and arrange all the prepared snacks artfully. Position the clementine pumpkins, mini pepper ghouls, melon skewers, ghost sandwiches, banana ghosts, and zombie apple mouths attractively. If desired, scatter some plastic spiders on top as spooky decorations. Now your vibrant Halloween Snack Board is ready for your little trick-or-treaters to enjoy!