Their are 9 models available from which you can choose. Simply press ?M’ on your keyboard and a menu showing off all graves pops up, letting you choose whichever grave you want. The model you choose will be remembered even after you log out. The Key can be customized in Minecraft’s Control Settings menu.
Graves always spawn facing east, but they can be rotated while sneaking (default, hold Shift key and right click block). They have 32 rotate stances. (every click makes it turn 11.5°)
Graves have a small chance of spawning a bunch of bones under your grave? Destroy the block to gather some bones
Choosing between all models available on the Grave gui ?
Rotating you grave !
Finding your own remains under your very own grave ? gloomy ?