These spaces now feature elements that transcend genres and traditional gender themes.
Decorators and retailers offer options that fling the design doors wide open, and how much fun is that for a child?
So let's check out what's cool, cozy and clever for kids' rooms.
New York designer Amanda Nisbet uses elements like pop art, '70s modern furniture, and crisp, energetic hues like bright yellow, soda orange and magenta to make bedrooms lively, friendly and fun.
Nancy Twomey of Alexandria, Va., blends neutral hues with dashes of gentle color -- soft coral, sea blue, fresh pea green -- and adds whimsical notes such as mirrored rabbit decals, papier mache safari animal wall art and ceramic tree stump tables to create charming, sophisticated rooms that children could enjoy from crib to college.
In modern families, some kids divide their sleeping time between a couple of households, often in rooms that serve another function when the child isn't there.
Providing such spaces requires a little extra thought and ingenuity, said Ikea North America's U.S. design leader, Josee Berlin. The aim is to help children feel at ease in their sleeping area.
Ikea's Kritter, Gulliver and Hemnes models would serve well as daybeds. A curtained rod can divide rooms like offices or large bedrooms into smaller spaces for young visitors.
Get something comfy underfoot: a fluffy, fun shag or a warm, flat-weave rug.
It's best not to make the theme of a child's room too narrow, said Jami Supsic, an editor at Country Living magazine.
"Use accessories and toys to identify the age of your child, but leave walls, window treatments and furnishings mature."
If your daughter loves princesses, don't buy everything from bedding to wallpaper. Go with an overall look that suggests the theme.
French chateau-inspired furnishings -- chandeliers, mirrors, rugs and furniture -- set the stage.
You can add tiara-emblazoned pillows, regal dollhouses, and other toys and accessories.
"They say girly girl, without saying baby girl," she said.
Kids who love magical-themed stories might like animal- or star-shaped table lamps, moody hues like deep violet or charcoal gray, and inventive and modular furniture that suggests a place of enchantment.
Imagine Living has a bear-shaped side table, and another that looks like a mushroom. One can imagine being down Alice's rabbit hole, or on the road to Hogwarts.
For boys who love dinosaurs or ships use colors that evoke that interest: a palette of greens and grays, perhaps, or oceanic blues and whites.
Reptile fans might love some of the photographic nature posters at www.zazzle.com.
Cool dino heads, wall-mounted sculptural art for any age, are at www.modcloth.com.
Patterns with a modern vibe can be found in nautical elements like wall-mounted anchors and sail flags, as well as shell shadow boxes and seashore-inspired decals. www.seasideinspired.com or www.zazzle.com.
Check out Land of Nod for eye-catching collections that reference themes kids relate to: Woodland Fairytale, Vintage Explorer and Black & White tap into storybook, adventure and artistic imagery.
Inspire an interest in the big wide world with tribal patterned bedding, pieces of African or Asian art, and accessories that open children's minds to the globe.
A collection of elephants on a bookcase; a recycled toy basket made halfway across the world; an origami mobile. Exposing children to other cultures just may be the most modern design move we can make.
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