Scotty in space

And of course nothing else would do :

From the StarTrek-site :

"According to Stevens, the family will fulfill Doohan's wish to have his remains shot into space on a "Memorial Spaceflight" provided by Space Services Inc. of Houston. Similarly, a portion of Gene Roddenberry's ashes were sent on such a flight in 1997. The date of cremation and of the spaceflight are not yet known.