Wash every piece of fruit thoroughly and pat it completely dry with a towel. Wet fruit won't hold chocolate chips or sit nicely for slicing, so don't skip this step. I like laying everything out on a clean towel so I can see what I'm working with before cutting anything.
Peel the bananas and slice them into rounds about one inch thick. Stand each piece upright and press two mini chocolate chips into the top for eyes. These little ghosts are always the first thing to disappear from the tray, so I make a few extra.
Take your peeled mandarin oranges and press a short celery stick into the top of each one to act as a stem. If you want more texture, use a toothpick to gently score vertical lines around the orange like a real pumpkin. It takes seconds and looks incredibly convincing on the platter.
Thread five or six grapes onto a toothpick to form a spider body, then snap pretzel sticks into shorter pieces for legs and tuck them between the grapes. Finish with two mini chocolate chips pressed on as eyes. I find small grapes work best here since they stay put more easily.
Use a melon baller or small knife to shape blueberries and strawberry pieces into mismatched "eyeball" clusters. Skewer a few onto a toothpick alongside a cube of green apple for contrast. This step is where you can really get playful with shapes and colors.
Group your ghosts, pumpkins, spiders, and eyeballs by color and shape rather than scattering them randomly. I like starting with larger pieces toward the back and smaller skewers up front so every item is visible and easy to grab.
Cover the platter loosely and refrigerate it for at least 15 minutes before guests arrive. This firms everything up and keeps the fruit crisp. Add your yogurt dip bowl right before serving so it doesn't get watery sitting next to the fruit.