I think it would be cool if Moonstone and Valestone had a use besides surveys; since the use was removed a couple years ago.
Valestone can increase health depending on size (Small = 1 peg, Med = 2 pegs, Large = 4 pegs, Shiny = 6 pegs)
Moonstone can increase your shield size, again depending on size (Small = 10%, Med = 20%, Large = 40%, Shiny = 60%)