I wanted to do something new and different that suggested Mecks. So I adopted a brassy-look rather than a traditional ork look. It's a big galaxy out there (a very big galaxy in the case of 40K :) ) so I do not think one should get fixated on whatever is fashionable at GW itself. Start your own fashion. A unique colour scheme is a bold statement that immediately unifies your forces into a theme.
With regard to basing, I reflected the brazen look with a dark burnt umbar brown topped off with red-brown rocks (and occasional cadmium red smears). Red is a splash colour on my army. I use it for leather-cloth artifacts like scarves or axe handles. I used an artificial green platform for the Dread for some variety. Green is repeated through the army by, well, greenskins. However, I added red-brown rocks strewn across the platform to maintain the theme.Another splash colour is that all lights, vision ports, goggles etc are orange highlighted in yellow and shiny-varnish finished. Again this is a theme unifying the army.
I do not play in competitions and I am far more interested in fun battles built around interesting scenarios than winning. Therefore, I really do not give a damn whether an army is 'competitive'. Built in weaknesses merely add to the challenge, and hence the enjoyment, in my view.