Here's my attempt:
Most of the "pale" colour options I think end up being too bright and "off-white" ends up be some shade of grey, so I went with a pale grey. I found that if you stick to the right column, the colours are less saturated and go well with grey. I went with green and teals for this one.
Since you called for a half-mask I actually went with the Organic Armor face. It offers the white eyes with the bonus that if you want bright, coloured glowie eyes you can do that as well.
Regarding your Dark/Dark redundancy comment, if you want to try other colour options/effects you can try Fire or Water Blast. 🙂