First, I just looked for a color combination I liked for an icon. Perhaps it's too similar to the one you're already using.

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Liking those two colors individually for icon colors, I then made one with a different Flagellocyte color and one with a different Phagocyte color (and small Flaglleocyte adjustment).

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I tended to like the Flagellocyte to be darker than the Phagocyte, and I tended to like primary and secondary colors typical of many logos. So, for something slightly different, I tried a lighter Flagellocyte and colors less typical in logos.
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