How do you pick the appropriate color thread to embroider with? I am making some screen purses for the ladies closest to me. I wanted to embroider a design on the bottom where the fabric is. I am using designed fabrics and my first one is a breast cancer fabric. You may remember awhile back I made a quilt in like 3 days for her before she left for treatment. I wanted to use the same fabric and same designs I used on the quilt. When I stitched the design, it disappeared. That was the point when I made the quilt but now I want it to stand out. It is a redwork design - what color should I use?

Since I'm doing more of these - is there a general rule when using designed fabrics - how to pick a thread color that will have a better chance of standing out? I always lay my threads on my fabrics before, but I don't seem to have the eye for this. My daughter does - but she's 1000 miles away right now :(