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.
Related questions
How can I choose the colour that awakens my fortune for my bedroom if I have no horoscope or cannot read it?
Take a colour catalogue and turn its pages with your own eyes: the colours you are drawn to are the ones that awaken your fortune. Use that colour along with the colour of the zone you sleep in, and if possible match it with your horoscope; it usually matches. Sleeping steadily for eight hours in that colour lets its planet act on the whole body.
Is a dark grey background necessary, for example when making videos?
No, it is not necessary; many videos are made without any dark colour. If Saturn or Rahu is strong in your kundali, dark colours may even suit you. A video is short, so do not worry much about it; think carefully about colours in the office and bedroom, where you spend long hours.
Parjanya is the devta of fertility, so why is married life said to be not allowed in a bedroom at E2?
A bedroom at Parjanya was never forbidden; it gives peace and deep sleep. What does not suit it is going there only for pleasure. When a couple goes there with the intention of having a child, following the method of establishing a kalash and keeping a diya, and conceives there, they give birth to the best child.
Should each zone of the house be painted in the colour of its devta?
Colours are taught in interior vastu; do not get confused now and focus on what is being taught.
Should golden yellow and white be used only in the North-East, or can the whole house use this combination?
The whole house can use it. The teacher has done a complete home interior in white and golden yellow, creating Gajkesari yoga throughout. When one colour combination is used in every direction, no dosh is counted.
The North-West was given green as its colour, but the shakti chakra shows it in blue. Why?
The colour on the chakra is the colour of the devta of that zone, not of the element; the North devtas are shown in red, for example, which is not a colour to paint there. The air element has both green and blue as its colours.