First up, the lighting at Piccadilly Theatre
Doorways around Whitcomb Street, Bateman Street, Great Marlborough Street
Varying blue tones as the paint fades and becomes distressed
Above the London Underground sign at Piccadilly Circus
A building on Brewer Street
Hoarding and signage around Broadwick Street and Piccadilly Circus
Reflections in a shop on Berwick Street
And finally, the fourth plinth in Trafalgar Square, an intense ultramarine blue!