Today is the first day of Advent! I don't remember seeing these in America, but in Germany they're a big deal. Basically each Advent Sunday a new candle is lit for the new week.
There are four weeks total, and a set of Advent candles has four candles, ranging from very tall to very short. The idea being that the first (tall) candle burns the longest (through all four weeks) and the fourth candle (the shortest) burns for just one week, so at the end all candles are relatively the same size.
I've put together the worlds easiest printable Advent candle set. You can use these with tea light candles and just replace as needed (shhhh, don't tell). Download your black and white printable here. Just cut along the dots.