What else is going on in the room? Furniture, bedding, flooring?

A spa-inspired blue or green would look lovely with the headboard.

Any suggestions if I wanted to keep it in the grey/beige camp?

Popular Gray and Edgecomb Gray are two versatile grays.

Geez, no blue on the walls. Stay in the greige selections.

Thank you both for the suggestions, thing is until we bought this headboard we were doing gray and my husband really wanted gray so I think staying in the gray beige tones safer to an extent. Although I do like Jillian's first picture, is that wallpaper?

Benjamin Moore Desert Light

The photo above is fabric from Carousel Designs.

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Shades of spa blue and taupe mingled into this unique paisley pattern make this fabric perfect for any home decorating project.
--100% Cotton
--This is a Drapery weight fabric.
--Pattern: Repeat: 13.75' H, 12.5' V
--Machine or hand wash separately, delicate cycle, cold water, mild detergent. Do not bleach. Line dry or tumble dry, low heat.
--Approximately 54" wide

Sold By Carousel Designs | Visit Store

watery

Perhaps sharing a photo of a loft we did will help with your inspiration.

Looking for wall col r suggestions? The bathroom has all chrome accessories but the vanity, mirror and light fixture will consists of gold to pop the vanity and tile some. The tile is Calcatta gold and an elongated subway tile. We tried variations of whites and light grays and had little liking. Thinking of going with a dark gray like the vanity using sherwin williams colors, thoughts or suggestions welcome. The idea is to make the tile pop.

Find the headboard color on the color swatch and paint the wall 3-4 shades lighter. Then you don’t have to worry about shades of gray not pairing well.