Unfortunately flash doesn't natively support this but you can convert between the color spaces using some help functions like the following which were found here:

function hsv2rgb(hue, sat, val) {So to create vivid random colors you just randomize the Hue, and set a high Saturation and Brightness. If you just want random shades of a color, you set the Hue and Saturation and just randomize the Brightness.

var red, grn, blu, i, f, p, q, t;

hue%=360;

if(val==0) {return({r:0, g:0, v:0});}

sat/=100;

val/=100;

hue/=60;

i = Math.floor(hue);

f = hue-i;

p = val*(1-sat);

q = val*(1-(sat*f));

t = val*(1-(sat*(1-f)));

if (i==0) {red=val; grn=t; blu=p;}

else if (i==1) {red=q; grn=val; blu=p;}

else if (i==2) {red=p; grn=val; blu=t;}

else if (i==3) {red=p; grn=q; blu=val;}

else if (i==4) {red=t; grn=p; blu=val;}

else if (i==5) {red=val; grn=p; blu=q;}

red = Math.floor(red*255);

grn = Math.floor(grn*255);

blu = Math.floor(blu*255);

return ({r:red, g:grn, b:blu});

}

//

function rgb2hsv(red, grn, blu) {

var x, val, f, i, hue, sat, val;

red/=255;

grn/=255;

blu/=255;

x = Math.min(Math.min(red, grn), blu);

val = Math.max(Math.max(red, grn), blu);

if (x==val){

return({h:undefined, s:0, v:val*100});

}

f = (red == x) ? grn-blu : ((grn == x) ? blu-red : red-grn);

i = (red == x) ? 3 : ((grn == x) ? 5 : 1);

hue = Math.floor((i-f/(val-x))*60)%360;

sat = Math.floor(((val-x)/val)*100);

val = Math.floor(val*100);

return({h:hue, s:sat, v:val});

}