For a simple ritual at home, this small tea-light based oil warmer makes a perfect alternative to incense. There is no reason that a ritual must smell like burning shoes. Choose oils and other aromatic items with properties appropriate to your working and let this warmer quickly transform your ritual space.
To take it a little further, you can use this warmer to replace more than just incense. With metal representing Earth, arromatic oils for Air, a candle for Fire, and green flowing glass for Water, you have the four elements. Then the flame below the bowl gives you masculine energy and the bowl represents feminine creativity. This simple item alone can help you create a complete sacred space.