Currently, the only version of Minecraft that supports any of these is the Java Edition. Bedrock players can't get custom heads yet, unfortunately. Here's how to get them on Java Edition.

You can get a command block in your Minecraft Java or Bedrock world using cheats and a special chat command.

For any Minecraft Java Edition players who want to add a bit more personalization to their Minecraft world, here's how to create custom designed shields.

If you enjoy creating custom worlds for Minecraft, you'll be a big fan of the 20W28A snapshot for Minecraft: Java Edition, which continues adding fixes and improvements to the Nether Update.