In a mixing bowl, combine the vanilla Greek yogurt, instant cheesecake pudding mix, and skim milk. Stir everything together until it's completely smooth with no lumps of pudding mix left behind. Set it in the fridge while you prep the fruit, since a slightly chilled dip holds its shape better on the tray.
On your serving tray, arrange the green grapes into a rectangular block shape, close together so there are no visible gaps between them. This forms Frankenstein's head and gives you a solid canvas to build his face on top of.
Line a row of blueberries along the top edge of the grape rectangle to create his short, spiky hairline. Keep the blueberries tightly packed so the "hair" reads clearly from a few feet away.
Press two candy eyes gently into the grapes toward the upper half of the face, leaving space between them. Add a small strip of black licorice across the forehead or along one side as his signature stitched scar.
Arrange the sliced strawberries and your extra fruit around the edges of the tray, filling in any open space. Place your bowl of dessert dip either beside the face or in an open corner, then it's ready to serve.