When making your tea lights, you'll need something to give them that desired round shape. Most candle makers opt for the same metal or plastic holders that you'll see on tea lights in stores. If you're not keen on splurging for a bunch of small candle holders, though, you can also use a silicone mould to help achieve the same sort of effect. In this case, you'll need something like an empty candle jar or old candle holder to hold your tealights instead, but these are generally much easier to come by (and cheaper too!).