If converting Warhammer 40K models is the aspect of this hobby I enjoy the most, then painting is perhaps that which causes most apprehension. It is painting that truly distinguishes the model from the toy, because here is where expression is transformed from gray plastic or bare metal, into vivid and captivating imagery. In choosing the paint scheme for your army, you can reflect its identity.
If your army is secretive or stealthy, then a dark color such as black or a dark red can reflect this. If your army is composed of noble and selfless heroes, striving for the common good, then a bright color such as white, or a regal color such as navy blue can reflect. If your army is from a rustic area then greens and browns are appropriate. Nor does your army need to be limited to a set color scheme.
Many of the races found in Warhammer and Warhammer 40K have units, which allow for different color schemes, marking them as special forces. Some races have a background, which also encourages varied colors; Bretonnian Knights for instance tend to have highly personalized heraldry, which means that even within one unit, there is a riot of contrast.
In Warhammer 40K certain warriors such as the Death Company of the Blood Angels, or the Aspect Warriors of the Eldar have color schemes, which differentiate them from the rest of the army. Amongst the Chaos Space Marines too, can be found different colors, marking out the forces loyal to the different gods.
Ultimately the only limit upon your army’s composition, form and color, is your own imagination, and it is this, which is your best defense against accusations that you are simply playing with toys or dolls. Both dolls and toys are simply items that you pick off a shelf, all dressed up and neatly packaged, ready for use.
They are all made to a standard image, and serve as nothing more than devices to entertain. Models on the other are yours; made by you, for you, and they do far more than just entertain. They inspire, and enrich, allowing you to indulge your creativity, and for people like me, they provide a chance to use your hands rather than merely your brain, to craft instead of just think, to build rather than merely conceive. This is again another reason why Warhammer and Warhammer 40k are among the best war strategy games ever made.