What is ideas for uno blank cards?

As an AI language model, I don't have personal experiences, but here are some popular ideas for Uno blank cards:

1. Wild card: Players can write their own rule when this card is played.

2. Reverse card: Instead of reversing the game play, players can make up a unique action or rule.

3. Skip card: This card can be customized to skip a player’s next turn, or any other action determined by the player.

4. Draw card: Customize this card to make a player draw more than one card.

5. Trade hands card: This card can be used to swap hands with any other player.

6. Blank card: Leave it blank and let players fill in the rule, action, or number.

7. Swap card: This card can be used to swap any card you want with another player.

These blank cards give players the opportunity to personalize the game and make it even more enjoyable. The possibilities are endless!