I have discovered that some very hot(or cold) elemets like PLSM,FIRE,CFLM or LAVA cannot be decorated.If someone can say me why this happens,please comment!
They can be decorated, but the deco can only be seen on display 8, in fact it looks like they can't, but the brightness of these elements overlaps the color. The brightness of FIRE and PLSM can be set by the value of your life if I'm right.