Start by cutting your cheddar and brie into fun shapes using small cookie cutters, saving the scraps to cube up later. Slice your pepper jack into cubes for texture, and top your mozzarella balls with candy eyeballs. Doing this step first keeps everything organized before the board gets crowded.
Set any bowls you're using for olives or nuts down onto your board, along with a skeleton centerpiece if you're using one. Add your cheeses next, spacing them out evenly so you have anchor points to build the rest of the board around.
Roll your prosciutto slices and tuck them into any open sections, then fold or stack your salami nearby to add height. Scatter the blackberries, grapes, apple slices, and dried apricots around the cheeses to bring in color and freshness.
Fan your crackers out in clusters near the cheeses so they're easy to grab, then use nuts, olives, and chocolate covered peanuts to fill in any remaining gaps. This is also the step where I like to tuck in a few smaller bowls for variety.
Finish the board off with plastic spiders, cobwebs, or skeleton hands tucked around the edges for effect. Step back, take a look at the color balance, and adjust anything that looks a little too empty before serving.