Use light, pale/pastel colors for the walls and ceilings
Choose cool paint colors to paint a room (e.g. blues and greens seem more distant)
Add height to rooms by painting ceilings with the lightest shade of the wall color or a pale sky blue
Paint crown moldings the same color as the walls
Avoid high contrast between the wall color and painted woodwork, furniture and decorations
Avoid wall patterns, borders and anything that draws too much attention to the walls
You could use wall decals to decorate instead of painting the walls. Most apartment facilities will not let you paint their walls. It can become costly and a hassle to repaint once you are ready to move out. !
