Shape-pegs give you ten hooks. Body-pegs give you another ten. For a set that scales to twenty-six, and doubles as a spelling and vocabulary tool, build an Alphabet-Peg list: one fixed, vivid image per letter, A through Z, based on a word that starts with (or sounds like) that letter.
A few starters to build from: A = Apple, B = Banjo, C = Camera, D = Dolphin, E = Eagle, F = Ferris wheel. Keep going through the rest of the alphabet on your own, picking one clear, easy-to-picture noun per letter. Write your full list down and drill it until each letter fires its image instantly, no hesitation.
Once it’s solid, this becomes useful anywhere you need to remember something tied to an initial, a person’s name starting with “M”, a category starting with “S”, by pointing you straight to a ready-made image to build from.