Control movieclips

Hello,

can any one tell me, what is the best way to control colors of movie clips with color picker?
I have example in attache file.

I wanna change color with color picker. When I start movie, color of MC’s will be grey but in frame 30 some mc’s will change color(depends what you pick with color picker).

in frame 1:
all objects( 1 to 17) = grey

in frame 30:
object1,2,3,4 change color
object 5,6,7,8,9 are blue
all other object who wasn’t pick are grey

i hope i was understandable

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