Raised flower bed

We have recently moved into a house which has this raised flower bed on the front lawn. I’m not much of a garden so I’m looking for some ideas on something to plant that’s quite low maintenance but will look pretty. I’m currently removing the weeds from inside. There is some rock cress growing around the outside. The soil is not great, has quite a few rocks etc in there. I was thinking maybe I’d rake these out and add some decorative bark to keep it tidy looking?
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(You’ll wonder where you left your gloves.)
If you live in Derbyshire, as I do.
You'd probably need to add a bit of decent compost to get the soil in good condition for planting, but it wouldn't need much attention after that.
I live in west central Scotland - not where that photo is...