Ah, sorry. I got distracted by the slider. Try it this way:
color1 = effect("Color Control 1")("Color");
color2 = effect("Color Control 2")("Color");
color3 = effect("Color Control 3")("Color");
color4 = effect("Color Control 4")("Color");
color5 = effect("Color Control 5")("Color");
colors = [color1,color2,color3,color4,color5];
seedRandom(textIndex,true);
i = Math.floor(random(colors.length));
c = colors[i];
[c[0],c[1],c[2]]*100