right now the two colors clash. I'd paint it white to match the trim. (unless you plant on painting the walls)

there are diff ways to disguise this. do a google search of "hiding 1960's interior planters"

if you paint it, you can top it w/a nice piece of wood and put some potted plants on it.

or, use it as a planters and put a large pot down inside and a tall plant. you have a light above. put in one of those grow light bulbs.
People underestimate the power of plants in decorating a room. w/the grow-lite bulb, you could get the tall snake plants (pic1) or some regular house plants that don't require much care.

I agree with Beth paint it white like your trim and throw some plants in there! or add a wood or other material top to use as a table

Not a fan of that two sided oddity. My personal preference would be to take a hammer and shovel, etc., to the planter and totally remove it today -- then take measurements to see what sizes of surface I'd need to begin refinishing tomorrow. If you cannot match the blue paint for the wall, then consider adding a chair rail with paneling or wainscoting beneath it and painting them the same white as the trim.

I would paint it white and put a piece of wood or stone remnant top on it so it becomes an entry table, with a mirror mounted on the wall above it. It would look more intentional and be functional.

Really like your two muted blue wall colors -- they work well together and with the white trim.

It looks like there are already supports for putting a board across it an inch or so below the top. Then you could put, say, a pebble mat, and then top that with plants in pots, or vases intermixed with succulents, or whatever.

I'd be tempted to take out the odd light hanging over it, both to give you more height to work with (or even a place to hang some art) and to add less emphasis. You could replace it with a flush LED fixture if needed.

If you cannot match the flooring, you could very deliberately create an accent spot on the flooring as a designated place for a hat rack or flower pot or plant stand or accent table or an umbrella stand or a basket or even a sculpture of small animal -- the kitten or puppy you don't need to clean up after.