Well I don't usually get involved with 'personal choice' questions as tastes can vary so much!

But I would opt for at least some spring bulbs which can go in now and they will flower next spring!

You could cover the edges with some winter pansies which will be available in the garden centres now!

Then you can have a browse here;
http://www.thegardenersalmanac.co.uk/Data/Plants%20for%20purpose/Plants%20for%20purpose.htm

How about Heucheras these give all year round colour and interest.

Or you may like evergreen grasses...( which would also look great with the bulbs Teegee suggested)The options are endless!!!!

You might put a small evergreen in the centre, perhaps a variegated one such as a euonymus fortunii, which can be trimmed as you wish and be cheerful all winter. Then you could have bulbs, winter pansies/violas or primroses for spring. the options for summer bedding are almost endless. Ageratums will flower until October and are very easy to raise from seed - and you can collect your own for the following year. Or you could use fuchsias. Or a mixture of winter and summer flowering heathers - lots of variety of habit and leaf colour there.

Thanks to each and everyone of you who replied your thoughts and comments very much appreciated.

Harri

Hope you let us know what you decide!

Hardy geraniums are a good plant, will creep over the edge and some will flower from may to october, great colour as well, and need very little care.