My little grouping of plants aren't as pretty looking as they could be. I have matching pots for the rest of my plants, just not these. So the last time I was at Ikea (the happiest place on earth) I purchased more matching white pots for them.
See what a difference it makes? They really make the grouping more intentional and fit the design atheistic of the condo.
You can do this with your accessories. Painting a mix-mash grouping all the same color makes them look like you planned it (unless you are going for an eclectic look - then leave them alone). It also gives them more weight and presence. Give it a try and see how it looks in your home!