First, make the "arm." Take the mozzarella log fully out of its packaging. Cut or separate a small section, about 1.5"-2", from one end, and turn it on its side to form the "hand." Wrap the remaining, longer length of the log in thin slices of prosciutto, working end to end so the whole thing is covered. Wrap the flatter "hand" portion in prosciutto as well.
Arrange both parts of the log in the middle of a large serving tray or board, and position a serving knife in between them so it looks like it's cutting "off" the hand. Arrange the rolled mozzarella sticks on the other side of the hand to look like fingers, slicing them off at varying lengths to mimic a shorter thumb, longer middle and ring finger, etc.
Set all your remaining items out on the counter so you can quickly size up what you have. Start filling in areas around the arm with a variation of fruit, crackers, slices of other cheese, etc. Add salsa or other dips in small bowls.
Work your way out to the edges of the board until it is full. Add any final decorative touches and extra forks or knives for grabbing/spreading/spooning the parts. Enjoy!