Soak 8 bamboo kebab skewers in a 9x13" dish of water. Dice ham, peppers, onion, and pineapple into 1" pieces - you will need approximately 30 pieces of each items. Assemble kebabs alternating pieces of ham, onion, pepper, and pineapple on each, using approximately three pieces of each per skewer. Place assembled kebabs in a 9x13" baking dish or container of similar size.