How do I decorate a room with a lot of stuff? [Quora question.]

 You don’t say what kind of stuff or the room in which the stuff is located. You also do not state if this is a rental property or one you own.

Gather or group items—toys, jewelry, CDs, DVDs, books, trophies, specific collectibles, etc.

Remove things that do not belong in the room to the locations where they belong.

Determine which items must stay.

Display no more than 3 or five like items at a time. A bookcase makes a beautiful display medium. Organize books by topic or genre. Box the excess items in pretty standardized uniform containers.

Do not get additional things to place in the room—stuff.

Reduce items before buying storage items.

Buy furniture that can also store things. An entertainment center, a bookcase, a display case can all help you put your best foot forward. Underbed storage can hide multiple boxed items. The high and low spaces in a closet can do the same thing.

• An old armoire or buffet sideboard can store things. 
• A free-standing screen can keep multiple things out of sight. 
• Small items can be stored in a chest of drawers. 
• A trunk can double as a table and storage place. 
• Old luggage can be filled with things and stacked.
• A side table with a floor-length tablecloth can hide many things.
• Boxes with a door-core or plywood top can become a table that hides much. 

Can you give us more information on the types of things you consider stuff and in which room the items are located?

Give the room unity, a serene, calm look with possible pops of color.

Floor to ceiling curtains on windows and storage areas can give a cohesive look when they match or complement each other.