Growing up in the 80's my mother introduced me to a trilogy she read. I don’t remember the name but they traveled to another world and worked to colonize it. 2064 or something idk. The books were paperback and fairly thick. I think the colors of the books were blue orange and green. Went through stages from Earth to the planet and their encounters.
This is presumably the Red Mars, Green Mars, Blue Mars trilogy by Kim Stanley Robinson, published over the years from 1992 to 1996. It fits the general description, with thick novels, mostly read in paperback, about the colonization of another planet in the twenty-first century.