All the ways that playing cards can be used

Ways that I will use, and possibly perform in front of people:

• Playing multiplayer games, or solitaire / patience games.
• Cardistry.
• Card stacking / house of cards.
• Impossible bottles.
• An improvised bookmark.
• (maybe) Polyhedrals.

Ways that I don't intend to use the cards:

• Card magic.
• Card throwing.
• Tear a deck in half.
• Cartomancy / fortune telling.
• An improvised bicycle noisemaker, a way to fix uneven table legs, or an impromptu toothpick.

References — [1] [2]