Colour matching is a big element of making your space suit your style, providing comfort and added value. Mixing the wrong colours can wreck a space just as fast as getting them right can take it from dull to wow. Plum is a particularly deep colour, so matching it with just the right hue to fit your personal tastes covers a whole range of ideas.
Using shades in various depth of colour from the same family creates a monochromatic theme which can have a subtle impact. Plum as the deeper shade can be accented with lighter shades of the same tone. Since plum can range from a rich purple with blue undertones, to a regal brilliant purple with more red aspects the shades should match your particular plum. A deep red toned plum mixes well with a soft rose as a big accent, then cool white to bring the colours out. A blue tinted plum is a dramatic deep colour that is softened by lavender and a pale white with a hint of the plum tone added to bind the room together.
Shades like sage, pale buttery yellow or even teal depending on the plum shade can be complementary to plum and make a good combination. Complementary means opposite on the colour wheel, colours of a completely different nature that enhance or even out a colour, especially one as dramatic as plum. A plum couch with soft sage coloured walls is an example of how both colours bring out the best in each other.
Jewel up the tones by mixing plum with other bright and bold tones. Add a deep green with a cool tone in accents, and a dramatic addition like a silver to make it really pop. Orange, gold, a deep shade of bright green, silver or even copper can set off the colour plum. Be careful when choosing a wall colour in these tones to be sure it enhances and doesn't drown the rest of the scheme.
Wheat, a soft forest green, pale rose, even white can be natural colours that blend with plum depending on the level of drama you want in your scheme. You could take it floral and pastel by using lavender, rose and cream with your plum, or the fruited plains by using a tan shaded wheat colour, a buttery yellow and a hint of a soft green in minor accents.