I just wanted to share an idea I used in Advent a few years ago. Instead of one Advent wreath, I had two–a dark one and a light one. For each week, we extinguished something and lit something else. This way, the darkness slowly overcame the light throughout Advent. We also used crackled glass with floating candles in colored water. This is the only picture I have of it. Feel free to use it and make it your own.