The practice of using puffy foam underneath satin or column sitiches to create a 3-D look to parts of your embroidery has been very popular on and off for the past at least ten years but this method of creating raised areas of your design becomes totally impractical if the garment upon which the embroidery is being placed is to be dry cleaned. The dry cleaning solution wil dissolve the foam and leave you with merely a very, very loose satin stitch. Another method to consider is to first digitize a skinny column stitch in the center of the final column stitch at full density. Then follow that with a slightly wider column stitch on top of that but still inside you final column stitch width and then finally finish that with your finished and top column stitch. Because none of your needle pentrations are in the same place you will not experience thread breaks, and you will end up with a significantly raised column stitch, which can serve as the focal point of your design. For example if you are digitizing a bouquet of roses and you want some of them to appear to more in the foreground use this underlay technique in varying degrees underneath the column stitches that make up those flowers. One row of underlay stitches under the roses you want in the mid-ground and two rows under the ones in the foreground and none under the ones you want to appear in the background. Try it it works. Good luck.