A bedroom for boys by designer Steven Gambrel and architect Martin Sosa has dramatic trim painted in Pratt & Lambert's Garnet. Picture: Eric Piasecki, Washington Post

Washington - Ask most designers what colour they usually paint interior trim - no matter the wall colour - and they will tell you the same: white.

My go-to trim colour for years has been Benjamin Moore's Decorator's White, a crisp chalky tone that, when used for trim, makes any wall colour pop. Occasionally, I will use Benjamin Moore's White Dove, a softer, creamier white that works particularly well in more traditional rooms.

But lately I have seen several designers breaking the mould. They have gone bold and painted window casings, door frames, baseboards and crown moldings bright, saturated colours.

Most prolific in this gutsy movement is New York designer Steven Gambrel of S.R. Gambrel. Gambrel likes to choose a deep-toned accent colour - plucked from another element in the room, such as an accessory or a fabric - for the room's trim. "Painting the trim a bold colour better defines the scale of the room, and it gives the room's architectural elements - windows and doors - more prominence," Gambrel says. He thinks of a room's trim as he would a picture frame: A strong-coloured frame focuses your eye and outlines that which is most important.

Of course, to paint trim a bold colour, it needs to be in good condition and worthy of the attention colour will draw. Neither is a problem for Gambrel, who works with some of the most prominent architects living today and who typically remains involved in the architectural choices from the beginning of a project.

When Gambrel's clients agree to go bold with a trim colour, he always cautions them to wait until the room is finished before they judge it; only once the textiles, furniture and accessories are in does the room make sense. "Painting trim against a neutral wall in an unfinished room feels too strong," Gambrel says, "but when you start layering in carpet, trims, art and objects, it all becomes more balanced."

A project by Meg Braff uses Benjamin Moore's Loch Blue trim to balance her Nanking print wallpaper. Picture: J. Savage Gibson Photography

Balance is important to Gambrel, which is why when painting trim a bright colour, he usually uses a textured wallcovering such as grass cloth or rough-cut plaster. The texture of the walls balances out the brightness of the trim; without the texture, he says, the room would feel too "jumpy."

For trim paint, Gambrel once used only the glossy oil paints from Fine Paints of Europe, but he has switched to Benjamin Moore's Aura semigloss paints, which are VOC-free. (He still uses Fine Paints of Europe for front doors and very special cabinet details.)

Designer Meg Braff likes to paint the trim a vibrant colour in rooms that have lots of windows and doors because, she says, "it unifies the space and makes the room feel less choppy." But unlike Gambrel, Braff does not always keep walls neutral and textural. Instead she opts for vibrant wallpapers, which typically inform her trim colour selection. In her rooms, the bright trim balances and anchors the busier wallpaper. In some ways it's the opposite of Gambrel; he uses textured walls to balance the bright trim, and Braff uses bright trim to balance the vibrant patterned walls.

Braff also likes to use vivid colours for the trim and cabinetry of butler's pantries and bars. She says these smaller spaces, particularly when adjacent to an all-white kitchen, turn into little jewel boxes.

Designer Katie Ridder paints trim bright colours, but she does so in smaller doses. Ridder likes to use bright shades on window mullions (the grids that divide windowpanes) to add colour to a room. She does this specifically in more-open floor plans, when one room flows into another, thereby making it difficult to switch wall colour. The other benefit of painting the mullions: You can skip the window treatments. This works well particularly in rooms such as kitchens where adding a curtain or shade might be awkward or bulky.

Interior by Katie Ridder. Picture: Eric Piasecki/Otto, The Washington Post

Before you decide to paint your own white trim a bolder colour, know one thing: Painting trim is time-consuming. All those edges and windowpanes need to be taped, and the paint must be brushed on by hand; you can't just roll it on as you do on the walls.