BlockHead

This mod lets you put blocks on your head.

Run the /blockhead command while holding a block to put it on your head. Run the command with an empty hand or with the -r/--remove switch to take the block off your head.

Use the -t/--top switch to put the block on top of your head like a hat.

Use the -b/--backwards switch to rotate the block 180°.

If you're in creative mode or you have the give privilege, you can put a specific block on your head with /blockhead <ItemString>.