Things that register no heat signals show up as blue. In this scene specifically, Dutch's shirt and rifle, as well as Billy's gear and rifle, are dark blue.
https://panstudio.co.uk/wp-content/uploads/2011/07/predator-vision1.jpg
Also, there is cyan blue in the color mix as well. More so then all the lime green. The problem is that the clear lime green is the base for the figure with red and yellow painted on. I think the base for the figure should be the same 'glowing blue' plastic used on the SDCC NES Jason. Then apply the lime green, yellow, red and cyan paint to it. Just my $0.02.
This would be awesome. Heat vision/glow in the dark Dutch.