Should the pen colour follow the birth rashi or the name rashi?
Use the rashi of the name you sign with, the name in current use. Trade and other moving (chal) matters follow the name rashi, while a house is built by the birth rashi. For example, someone signing as Pramod uses Kanya rashi.
Related questions
As an interior designer, clients choose their own colours and I cannot check their planets; should I give a remedy or try to convince them?
Do not try to convince anyone. People mostly like the colours that match their own planets. If a client chooses an anti-element colour and their kundli allows it, never stop them; it will bring them benefit.
Besides exaltation, debilitation and degree, how do we judge whether a planet is good or bad, for example in the 6th or 8th house?
The 6th and 8th house rule has not been given yet. The full rules will be taught later using example kundalis of five students. For now judge by exaltation and debilitation; not every 8th-house placement is bad.
Can a bedroom be made at Shikhi (E1), and why should it be white rather than red?
Yes, a bedroom at Shikhi can suit elderly people, and it should be painted white rather than the zone's red colour, as advised for people of kapha nature and for those of pitta nature whose heat rises quickly. Shikhi is highly sensitive and already hot, so red would add heat and open the third eye.
Can a false ceiling be painted blue, and will it cause problems?
Light sky blue that matches the colour of the sky can be used and causes no problem. If the blue is dark, paint small twinkling stars on it to nullify its effect.
Can a person whose Sun is debilitated (neech) have the drawing room in the East?
Yes, with remedies; he will not leave the East unused or build a toilet there. A drawing room is not a permanent seat. Only permanent seating, such as an 8-hour business seat, should not be chosen in the zone of a debilitated planet.
Can blue be used in the North-West?
Light green or a shining lustre white is better than blue in the North-West.