Okay- You don't have to use the fill toggle if the sticker is colored but you do if you want them to be able to color a white sticker.
You know what I mean? I have some textured white images added to give texture to the patterns. These don't let the person change the color in CASt even if I add color to it in CAP.
I did check that out- gave me a few problems because there were supposed to be altered colors and yet didn't show color.
Now I can use the white sticker for color if I toggle the Fill.
http://i2.photobucket.com/albums/y48/Rflong7/LayersFill-1.jpg
None are set to fill.
In game- The white isn't changeable but the green is...
http://llnw.thesims3.com/sims3_asset/sims3_asset/media/252/379/005/00/screenshot_original.jpg"width=600"