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..you might like something like this, it's Hebe 'Red Edge', and would be available in most good garden centres, probably about £7-8 .... it's proved very hardy for me, takes no notice of the severe winters and does not shed leaves or need little trimming. The leaf colour intensifies in cold weather and has little mauve flowers in summer... it gradually spreads into a nice bushy plant like this, after 2 years or so...
Hebes are a good suggestion as there are loads to choose from. What aspect is your garden Fabio as that will make a difference too?
If you are looking for a nice manicured look - I think you cant beat good old box...... Buxus Sempervirens "gold tip" would be my choice. Phormium would look striking as a centre plant - you can find lots of varieties with red striped leaves which would make a nice contrast with the green and gold varieagated edge. If it were my garden I would put loads of tall bulbs either side of the phormium - just to add a bit of colour.
Rosemary is an excellent low maintenance shrub - it's drought tolerant and evergreen, and can be pruned into a manicured look or left to its own devices. As a positive side effect, it sometimes flowers, and you can use it in cooking!
I like all the above ideas. I would keep the planting to one plant type only. It will make a statement and look good and be low maintenance. The raised bed sounds well draining so a large bed of English Lavender would look and smell wonderfull, esp in summer.