It's hard for me to judge how a mech with certain camo will looks in action when viewing it in the bay (because of different lighting and background). But most mechs I see in combat look darker than background for me, so I think it's wise to choose lighter colors (and don't forget we also have four! more-or-less snow maps now). Colors choice for universal camo is more or less obvious: grey, tan and green.
Pattern is another story... I think, Woodland is more appropriate, as Tiger Stripes are too thin to provide any disintegration of silhouette at any sane distance. I also have an idea that perhaps one of the colors should be darker to break silhoutte better.
As scale of camo greys are very limited, I suggest using the colors from "general" varieties of grey, though they're more expensive at 1000 CBs vs 500 of camo colors.
So a Jenner in one of the UniCam variants I consider will look like this:
 
					
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