I ofr one can only suggest the colourscheme of my 28mm classic cadians. as I love it!
flectarn sleeves and tack vests, codex grey trou and dark angles green armour (for pads and helmet). for the flectarn I tend to base with catachan green. with splodges (well peadot effect) of bestial brown, camo green, karlock green and chaos black. with devlan mud over all this. it looks just like flectarn when these colours are used...
or the obvious choice for you would be an urban camo. I'd suggest the shadowgrey, skullwhite, chaos black tigerstripe scheme, with snakebite leather pouches as of the cover to codex cityfight...