Here’s some terrific advice from Emma Allen of Perfect Little Stitches:
For some embroidery designs, you should probably use exactly the same colors that the designer used. This rule might apply to animal portraits. But for almost any other design, you will want to choose colors that make you happy.
Let’s say you want to stitch a floral design. The designer used a particular shade of purple, choosing from whatever thread colors she happened to have in her stash, and going with whatever color nature assigned to that flower. And if that is the look you want, then that is fine. But perhaps you prefer a bluer shade of purple, or one that is darker, or more pastel, or maybe you don’t like purple at all. Look through your thread stash. Those are probably the colors you like most (or why else would you have bought them?). Find a color that looks best to you, that coordinates with the fabric you are using.
You might also choose to use an entirely unconventional color scheme, perhaps all shades of a single color, or shades of gray with one bold accent color. Play around with color choices in your embroidery software, then test-stitch if you are still not sure. You will probably discover new color combinations that make your heart sing.
Source: StitchFun News