Just pulled these out of the pot and awaiting full cure before I can polish.
I am thinking of doing glittery red high values.
As to balance issues, the inserts are made from the same resin, tinted with resin dye. The amount of stickers do add a small amount of weight (the package of all 10 sheets weighed just over 1g, but I barely used the stickers from one sheet through the set), but it is nominal.