I once read a comment from a prominent interior designer that every room should contain some black. I can’t remember who said that but is has always stayed in my mind. I think it is very true. Black is grounding and every colour looks good with black.
But for me, I think every room should have a splash of red. It is uplifting. It pops. Even if it is just a vase of red roses, the colour just seems to say to me ‘this room is finished now’.
Just take a look at these dining chairs. In every case they draw the eye and just make the room sing….

Lady P Chair and Xavier Pauchard Chair, The Conran Shop. Olle chair, Ikea.
Knoll Risom chair, The Lollipop Shop. Tokujin Yoshioka for Kartell Ami Ami Chair, John Lewis. Eero Saarinen inspired Tulip Chair, Pash Living.

Kartell Victoria Ghost chair, Made in Design. Harry Bertoia inspired Wire chair, Pash Living. Emeco Navy 111 chair (made from 111 recycled plastic coke bottles), The Conran Shop.

Patrick Jouin for Kartell Thayla chair, Panton S chair, Philippe Stark for Kartell Mr Impossible chair, all John Lewis.
Or you could just get the red paint out!