One of the paint colours I chose for the walls, a gray, didn't turn out the same shade as the chip (it was a Benjamin Moore colour that was mixed in another retailer's paint). I later found out they used very cheap paint and took a lot of shortcuts in application, creating a sloppy mess. So, although super excited about my 'custom' home, I was always kind of frustrated at how 'off' the colour scheme looked. Although I received lots of compliments, inside I was disappointed and frustrated at the end result.
Because of being limited to choosing only 3 colours (or paying a lot extra to choose more), this same grey is also in both girls' bedrooms. But, the main level of my two-storey house was the main source of my frustration. The gray on the walls of my living room had a definite green pallor to it, while the carpet that looked charcoal gray in the showroom actually has a brown hue in it. So, not only did the living room not look right, it was clashing with the open concept kitchen/dining room that had a charcoal gray in the flooring as the two floorings met.