Here's my take on the E90 interiors:
Black, Grey & Beige - Good but not outstanding. Everything's in the same colour. Trims will break the monotony but only interiors with wood trims will pull through for the 'wow' factor.
• Black - sea of black nothingness but easiest to look after
• Grey - not exactly ugly but nothing to shout about, either
• Beige - needs a wood trim to work nicely
Lemon & Terra - Now, these are something else. They're the only interior where plastics are black to contrast the leather. Even door panels are classy with black grab handles for a nice touch. Interior as a whole looks elegant. These leather colours are difficult to accurately reproduce. Don't be misled by what you see on the net. They have to be seen IRL to be appreciated. Be prepared to be bowled over – 'wow' becomes 'WOW !!!'
• Lemon - commit yourself to keeping your beauty beautiful
• Terra - easier to keep but matches limited exterior colours
Favourite: Black Sapphire with Lemon interior.
Any trim but best with Burr Walnut.
Re-think your blue ?