I think I had these, too, but I don't remember the original packaging.
I remember calling them "bricks" and that they were red, but there were
white and clear ones, too. I liked the little casement windows and
doors that actually opened. The roofs were tacky green cardboard that
you could fold for a gable, but I never used them. I sometimes made
individual buildings according to plans in a book, but I particularly
enjoyed laying out whole cities in plan. Cars came from cereal boxes,
and people were marbles (they fit in/under the cars). I still have some
of the accessories, but my parents got rid of my toy bricks when I went
off to college to study architecture. I miss my bricks...
Ilene