Bright decorative candle
First you remove the ground at the place where the candle should stand later. There you stack 5 snow steps on top of each other.
Now place an armor stand on the snow steps. You should make sure that the armor stand is as straight as possible.
Now you put your chosen candle head on the armor stand. You can find heads like this for example on:
Now place a block above the armor stand which belongs to the shelf. Then place a plunger (not a sticky block) directly above the block and use the plunger to push the block down until the candle is visible.
As soon as the candle has come to light you can remove the plunger again. Now aim at the block on which the candle is standing and place a torch on the block. Then the torch disappears into the head and the candle glows.