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Use the right hanging method. "When hanging your frame on the wall, you should make a mark slightly above where you want the picture to hang and add a trim nail," explains Hardin.

Embrace Mishmash “Hang frames of different styles on one wall. This will make it seem like a display that’s been curated and collected over time, even if you’re putting it up all at once.” ...

Size of wall space: The grid system is more flexible, as it works well for walls with little or a lot of wall area. You can hang pieces as high, low and wide as desired.

You'll have to arrange your furniture to create the suggestion of a wall. There are a couple of well-tested ways to go about that, each substituting a sofa or love seat for an actual wall.