borders

Mahonia x media, Ilex, Wegelia , Spiraea , Forsythia, Chaenomeles,Buddleja,Perovskia,Laburnum,potentilla,Viburnu tinus,Viburnum , Berberis ,Lavandula,Hydrenga,Philadelphus,Corylus maxima 'Atropurpurea', Ribes,Syringa,Tamarix,Sureau,Cotinus,Hibiscus, there are so many shrubs for make a free hedge you can use conifers but it's more expensive and more long for get at tall free hedge

Sorry i misetook Sureau is the french name latin name Sambucus

If you mean a selection for all-year colour from flowers, then Alexandre has given you a good selection to check out. If you mean shrubs that are evergreen, I recommend the Euonumus fortunei group, especially 'Silver Queen' for its silver and green foliage. I cut mine back when necessary - it's very good-natured. It can be as big or as small as your space dictates.

Choisysia ternata 'sundance' is cool or coprosmia beatsons gold or Euonymus fortunei 'Emerald and gold or philadelphus coronarius 'variegatus'. These will all give you that colour you desire in your shrub border all year round through their emphatic foliage and from my own experience they are not overely intrusive however like all beautiful borders they will require some maintenance.

Best of look with it.

I'm assuming that when you say not intrusive you mean tidy-looking without growing huge or needing constant clipping.

Pittosporum tenuifolium is an evergreen shrub which isn't high maintenance at all as long as you get a cultivar which isn't going to grow big, and has varied foliage colour. You can clip them or leave them alone. Some also have scented flowers although don't expect to see the flowers - they are very unobtrusive. Depends what size you want but Pittosporum 'Irene Patterson' has cream variegation and Pittosporum 'Tom Thumb' is perhaps the smallest pitto with older leaves of purple and new leaves green as contrast. I have 'Tandara Gold' which grows to about 2 metres and has green and gold variegation. Some of the other pittos grow up to 4 metres so make sure you get a type which isn't going to get too big.

Sarcococca is a compact evergreen shrub which is neat-looking year round and handy for a shady spot. Again, the flowers aren't all that noticeable but in winter they have a fantastic scent so it's worth growing for that alone.