More precision :)
100 existing objects = selection

Style 1 to style 100 are a gradient that we can easy manage if
we can make something like this
of course increment can be anything, and start color anything following wish of the artist :)

pseudo code
/start colors
red=12
green=15
blue=20

for i= 1 to 100
Style i = red, green, blue
object i =Style i
/increment
red=red+2
green=green+3
blue=blue+7
end i

of course if 255 is the max for each Red, Green, Blue we take another increments and/or start colors :)