There are liquid scents, fragrance oils, and concentrated scent blocks. It is a good idea to add these once your wax is completely melted and you have removed the wax from heat. This will help to not burn off your scents. Liquid is a great form of scent and the most cost effective form. I can buy these blocks for 1.99 at a craft store.
Fragrance oils are also an option.
If you are going to use the fo's make sure that they are wax friendly. Some are not and they will not mix well with the wax. Ask who you are buying from to make sure, they are usually happy to help. Dye alternitives There are as many ways to make candles as there are ideas. One thing about using crayons is that they are colored with pigments that will clog the wick and will not allow your candle to burn.