BlockHead

This mod lets you put blocks on your head.

Head blocks persist between sessions. This mod is suitable for both survival and creative.

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 -t or --top to put the block on top of your head like a hat. Use -T or --translate to apply an arbitrary offset.

Use -b or --backwards to rotate the block 180°. Use --left or --right to rotate the block 90°. Use -R or --rotate to rotate the block by any angle.

Use -S or --scale to change the size of the block.

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