Changing beds

Hi all,
I put in four beds in the middle of my lawn a few years back, two of which were conifers, dogwoods, muscari and water bowls, the other two were long grass and urns with flowers.

I put in four beds in the middle of my lawn a few years back, two of which were conifers, dogwoods, muscari and water bowls, the other two were long grass and urns with flowers.

I want to change this up as my son now has a very strong grass allergy so long grass is off the menu.
The dogwoods haven’t thrived but I’m willing to give them another year. The conifers, well I think I have to either double down and put more in to fill out the bed or try something new.
Ideas?
Ideas?

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What's the soil like, also is it a sunny site? I'm guessing so.
I tend to prefer symmetry and organisation, so I was heading towards topiary in the other two.
Soil is clay, I’ve put in a fair amount of organic material into the non-grass patches in 2020, 2021 but not excavated as that will just form a subterranean pool in winter.
Lots of sun. My grape vines, rosemary and lavender lining the path do well. I put in a young beech hedge behind the borders to provide some summer morning shade.
You could look into box alternatives for topiary (l speak as someone whose box plants were attacked by box caterpillars/moths 😢 last year)
Think I'd go with a multi layered zig zag or even circular ( they lots you can do really ) pattern with hedging of your choice. Have you got anymore pictures of the area ideal from the bedroom window ? could have the bowl raised up off the ground and let the hedging grow around it to make the bowl look like its sitting on top of the hedge.
I could combine the water bowls sort of stack them to make a fountain maybe? They are of decreasing size and fairly hefty corten steel.
I were under the impression you were getting rid of the grass after reading it the first time, but now I don't think you are you are just avoiding ornamental grasses . Either way you could still do something similar with hedging ( bux / berberis /ilex crenta / pittosporum etc ) with the shape of the garden now.