Garter stitch is easy to chart, because 1 stitch is as wide as the height of one ridge (2 rows). That means you can chart it on square graph paper, with one block equal to one stitch and one ridge (2 rows). The other nice thing about this is that you can shape the edges very easily by casting on or binding off along the sides of a piece.
That’s what I did to make this candle. The three pieces are just garter stitch, worked to a graph that was the shape I wanted. A little embroidery serves as a wick.