Images via: (clockwise from top left) 
“Пиксели” by Asparukh Akanayev (cropped from original), “Primary Colors” by Peat Bakke (cropped from original), “Primary too” by Scott.Symonds (cropped from original), “it’s a matter of primary colors” by Elia Scudiero, “Juergen_ButterflyFish” by Creative Linux (cropped from original), “Deep Blue Cafe” by Les Haines, “This spoiler did not spoil my day !” by Marja van Bochove, untitled by Retinafunk (cropped from original)
