Use sand instead of pebbles. Some jars can be coated with glass paint to match colored bottles. 12 quart size jars are about Suggest different sizes. Small jelly jars are "quilted" creating a faceted glow from candle.
Forcing hyacinths to bloom in water was a Victorian passion that fell out of favor in the twentieth century -- perhaps because garden writers made the process seem more complicated and mysterious than it is.