Off the top of my head, Hebes, skimmia, Brachyglottis , helianthemum , it depends on the sort of height you want, but there's a fair few smaller ones listed here
Shrubs evergreen or deciduous? Skimmia, small hebes, daphne for evergreen Dwarf lilac, hardy fuchsia. Small perennials with grasses Herbaceous clematis Heucheras
I'd personally avoid Skimmias. Unless you can give them the right conditions, they tend to look dire. Especially when not in the ground. Pieris would be better, if you can have neutral to acid conditions in the container, as they have better all year round appeal. Bear in mind that even one shrub will take up quite a bit of room, so you may need to be doing a bit of regular pruning, and make sure you don't just use multi purpose compost I'd suggest Osmanthus burkwoodii. I have that in what is effectively a container. Evergreen, glossy green leaves, small white scented flowers in late winter/early spring. Very straightforward, no problem with tidying up regularly if needed, and works well with almost any other plant. Euphorbias would also work well - fairly unfussy once established, but choose wisely. Some can get big, leggy and a bit invasive. Hellebores would also be quite happy. I have some in bud just now - Hellebore niger. If you can divide up your container, with a lined, timber barrier, it would give you more scope too, as you could have plants which like moister conditions next to ones that like really light soil.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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Lavender springs to mind for summer assuming you've got good drainage. You could plant bulbs such as narcissi and tulips for Spring colour.
https://www.rhs.org.uk/advice/profile?pid=845
Skimmia, small hebes, daphne for evergreen
Dwarf lilac, hardy fuchsia.
Small perennials with grasses
Herbaceous clematis
Heucheras
Pieris would be better, if you can have neutral to acid conditions in the container, as they have better all year round appeal.
Bear in mind that even one shrub will take up quite a bit of room, so you may need to be doing a bit of regular pruning, and make sure you don't just use multi purpose compost
I'd suggest Osmanthus burkwoodii. I have that in what is effectively a container. Evergreen, glossy green leaves, small white scented flowers in late winter/early spring. Very straightforward, no problem with tidying up regularly if needed, and works well with almost any other plant. Euphorbias would also work well - fairly unfussy once established, but choose wisely. Some can get big, leggy and a bit invasive. Hellebores would also be quite happy. I have some in bud just now - Hellebore niger.
If you can divide up your container, with a lined, timber barrier, it would give you more scope too, as you could have plants which like moister conditions next to ones that like really light soil.
I live in west central Scotland - not where that photo is...