Hard to believe this is allowed.  I know ashes are allowed.   No doubt you would have to have very special permission.

 There's the water table to be considered, and obviously cemeteries have to consider this.

 However my uncle FRANK is quite willing to bury anyone that annoys me, for free!

  His view from the a tomb.

 T.I.That was Bing Crosby.  (but never mind, some other time ).