Decorate for the scale
The challenge of a ballroom is size. High ceilings and big floors swallow anything low or small, so decor that would look generous in a garden reads as sparse here. The fix is to work vertically and dramatically: tall centerpieces, hanging installations, uplighting up the walls, and drapery that draws the eye upward. You are matching the room, not filling every inch of it.
Height is everything
The single most important move in a ballroom is getting your centerpieces off the table. Tall arrangements on raised stands, candelabra, or suspended florals bring the decor up into the volume of the room where guests actually see it. Mix in some low arrangements for intimacy and cost, but every table needs some height or the room reads empty above eye level.
Lighting and drapery
A ballroom lives and dies on lighting. Turn the house lights down, then build the room back up with warm uplighting on the walls, pin-spots on the centerpieces, and candlelight on the tables. Fabric drapery softens hard hotel walls and hides anything you would rather not see. Together, lighting and drapery do more to transform a ballroom than any amount of florals.
Where the budget goes
In a grand room, spend on the few things that read at scale: lighting first, then tall florals on at least the key tables, then a statement at the focal point, whether that is the head table, the stage, or the entrance. Save on the small stuff that disappears in a big space. A ballroom rewards a few large gestures far more than many small ones.
Keep it cohesive
Because a ballroom is formal, consistency matters more here than anywhere. Pick one palette and one metallic and carry them through the linens, the florals, and the lighting, and keep the arrangements matched rather than varied. Ground the whole look in your wedding palette so the grand room reads as one intentional design.