Do you all wind bobbine from your Emb. Thread or buy bobbins of a different weight?
If you want the lace to look the same on both sides then use the same color in the bobbin as on the top. It takes a little more work but well worth the effort.
I always use the same color on the top and in the bobbin - I change the colors in each. I too, like the effect of it being the same on both sides.
For FSL, I usually change the bobbin thread to match the top thread. That way, the design looks the same on both sides. It takes a little more time and trouble, but I like the results.