The living room is the hardest room in the house to buy art for, because it is the one you look at longest and from furthest away. Most sofas sit two to three metres from the main wall, which quietly rules out prints that depend on fine detail and rewards work with a clear underlying structure. These prints are chosen for that distance: legible at range, with enough tonal depth to stay interesting when you are sitting directly under them. Unique wall art for living room walls is harder to come by than the search results suggest: the large print shops license a design once and then sell that same file to everyone who orders it. Everything here is generated rather than licensed, and printed once the order is placed rather than pulled off a warehouse shelf. If nothing below suits the room, a new piece can be generated to your own brief — including to the colours already in it.
245 prints

Floating Glass Conservatory

Abstract Teal & Ivory Square

Vibrant Abstract Geometric Art

Minimalist Earth Illustration

Serene Earthy Abstract

Minimalist Earth Art

Minimal Monochrome Earth Poster

Modern Abstract Blue Birds

Serenade in Flight

Warm Currents

Monochrome Majesty

Verdant Whispers

Purr-fectly Pop

Feline Faces in Monochrome

Whispering Leaves

Whispering Blooms

Serene Sanctuary

Earth in Focus

Simplicity of Home

Stellar Symmetry

Starstruck Symmetry

Zestful Whirl

Autumnal Harmony

Petal Enigma
The evidence here is real but narrower than most decorating advice implies. Research on restorative environments — Ulrich's work on stress recovery, and the Kaplans' attention restoration theory — consistently finds that views of natural scenes speed physiological recovery from stress, and the effect survives when the view is a picture rather than a window, though more weakly. That supports a modest claim: in a room used for winding down, landscape and natural-form imagery is a defensible default. It does not support the stronger idea that any particular colour reliably produces a particular mood on its own.