However distinctive your style, creating a beautifully designed home often hinges on how you use colour – and one of the most intriguing ways to approach it in 2026 is through Dulux’s ‘peek-a-boo’ paint theory.
Confident yet cleverly controlled, this emerging trend challenges everything you may have been told about ‘clashing’ shades. Instead of playing it safe, the peek-a-boo paint theory encourages you to pair colours from opposite sides of the colour wheel — just on a smaller, more intentional scale. You may be surprised to find the outcome is not chaotic; it's complementary.
Below, we interrogate how to embrace the trend and master the art of contrast at home.
What is the peek-a-boo paint theory?
The peek-a-boo paint theory is built on the idea that bold colour doesn’t have to dominate a room to make an impact. Instead, it appears in vibrant flashes — inside cupboards, along skirting boards, within alcoves or on the reverse of doors.
It’s a decorating approach inspired by fashion, where a neutral coat might conceal a vibrant lining, or a classic outfit is lifted by a flash of unexpected colour. The detail is there to be discovered, not declared.
In interiors, that might mean pairing a softened blue with a warming clay tone, or a muted green with a dusty red. The contrast feels modern and expressive — but because it’s used sparingly, it never overwhelms.
Why contrasting colours create harmony
For decades, many of us have been warned away from mixing bold shades. But colour theory suggests the opposite.
On the colour wheel, hues that sit opposite each other – known as complementary colours – are naturally balanced. Although they differ in tone, they visually enhance one another.
Marianne Shillingford, creative director and colour expert at Dulux, says our hesitation around contrast often comes from outdated rules.
'We were taught to think of certain combinations as "wrong", but these opposites are often the most exciting partnerships,' she explains. When two contrasting shades are handled thoughtfully, they actually bring out the best in each other.
Marianne notes that we instinctively respond well to contrast because we see it constantly in nature – from bright blossoms against green foliage to blue skies meeting terracotta landscapes.
'Our eyes are very comfortable with contrast. It creates clarity and energy in a space. The trick is in how you use and where you place it.'
Whether your palette is in bright, earthy or moody hues – like the kitchen below, which brings in pops of contrast via the cabinetry – the duo is impactful.
'Opposites don’t have to shout to work. These details give a space rhythm. They make contrast feel modern, thoughtful and quietly confident,' adds Marianne.
How to use the peek-a-boo paint theory at home
1. Start with small architectural details
One of the easiest ways to experiment is by painting the inside of cupboards, bookcases or stairwells in a complementary shade. These subtle contrasts add personality without changing the overall feel of a room.
Marianne recommends choosing slightly softened or earthier versions of opposing hues to keep the effect refined rather than stark.
'It's not about the brightest version of two colours competing,' she says. 'A dustier blue with a warm clay or a mellow green with a muted red feels far more sophisticated.'
If you don't have organic architectural features in your home, consider faking it by using painter's tape and paint. Bring the paint part way down the wall, as below, to imitate a dado rail.
Dulux
2. Create intrigue through doorways
Door frames and the reverse side of doors offer natural opportunities for surprise. A glimpse of a contrasting colour as you move between rooms makes a home feel layered and connected.
In the hallway below, plummy doorway tones sets the ice blue stairs on the other side alight – it's dramatic, like discovering a secret.
3. Add contrast to trims and edges
Skirting boards, cornices and windowsills are perfect for introducing a playful flash of colour. A buttery yellow trim beneath a cool lilac wall, or a terracotta skirting against a muted blue, can subtly energise a scheme.
Because these elements frame a space, the contrast feels intentional rather than overpowering. Below, a vibrant cobalt skirting board richly contrasts with an orange windowsill opposite. A unifying artwork between ties the scheme together.
4. Let one colour dominate
Balance is key. Allow your primary wall colour to set the tone, while the contrasting shade acts as an accent.
This measured approach is particularly appealing for those who feel ‘cautious but curious’ about bolder decorating choices. By keeping contrast contained to details, you can experiment with confidence.
Here, a pantry painted in Farrow & Ball's Bamboozle contrasts subtly with the existing green cabinetry in the kitchen.
Where the peek-a-boo paint theory works best
The trend thrives in spaces with architectural features or built-in storage. Prioritise:
- Kitchens with pantry cupboards or open shelving
- Living rooms with alcoves
- Bedrooms with fitted wardrobes
- Hallways and transitional spaces
- Rooms with joinery
It’s especially effective in modern homes that need character, or period properties where detailing can be highlighted with a clever pop of colour.
Ultimately, this paint theory proves that contrast doesn’t have to be loud to be impactful. When used thoughtfully, opposites don’t clash — they collaborate.
As Marianne puts it: 'Colour should feel joyful, not intimidating. Sometimes it's that unexpected pairing – used in just the right place – that makes a room truly sing.'
We couldn't agree more.
