Basically the colours options get you what ever is in the unpainted version, painted. So for example as the as the Company Commander level expands to include extra figures, so does the amount you get painted for a colours pledge as those figures become part of it too.
So the silhouette thats under the unpainted mechanised commander showing the quatities of miniatures is what you will get for parade colours, but painted. Anything that is added to this, is what you will get painted.
What it does not give you is stretches that are additional buys or new pledges in their own right, such as the strike hawks or galacia's, that is why there are new painted pledges offering these painted.