When Saruman died in RotK, it said that a white mist rose from his body and passed into the west. I guess this was a 'spirit form' of sorts, like the ones the Ainur had before fashioning new and tangible ones for themselves as it says in the Silm. This is one possibility; nothing that I have found so far confirms it, and in TTT Gandalf says himself that he waould not darken the light of day with that tale. Though there are hints given in several places, the real answer remains a mystery.
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