What colors are the basics to use?
There are no basic colors to use, if I understood your question correctly.
The rule is to use subdued colors for the siding and trim, and a contrasting color for the front door. As a general rule I would advise against shades of blue (even though I think Eichler used some very "warm" blue, if I am not mistaken) and pink for the siding.
The beams can be various shades of gray (from off-white to very dark gray), with a warm tinge to them (more brown, less blue).
Ceilings must be left mostly alone if still with original stain. If not, neutral colors like Benjamin Moore OC-17, OC-18, OC-19 or OC-20 or equivalent Cabot colors work best.
Use flat or semi-flat finish paints for everything but the front door, which could be semi-gloss in a bright contrasting color in relation to the rest of the house.
You can also check the Jerry Ditto Eichler book for ideas. It has lots of color photos of Eichlers in pristine condition--many faithfully restored.