Hmmm. Let me see.
A garlic press to push patterns in paper, a pizza cutter to cut circles, a potato peeler for curling paper.
String and sellotape for everything. We dont have any craft materials so ds just makes do with everyday stuff. Builds the imagination.
He once wanted a guitar like a friend of mine so took his play guitar and spent days cutting bits of elastic and fixing them to the toy one by one until he had a "proper one" It took a long time. Once finished though he lost interest. He often adds stuff to his toys to make them more realistic and spends hours adding details. One stage involved taping microphones to everything and another the bits on train wheels to make them more realistic.
He loves anything in the stationary department and we buy a ball of string and a roll of sellotape at least once a week