Whilst the bright white flowers of this Oxalis ("Burgundy Wine") are lovely, they pale into insignificance beside the glowing purple leaves:
The leaves are very "dynamic" - they open and close according to the light conditions. When it is hot they fold up like little umbrellas, but when it is cold they spread out to maximise the opportunities for absorbing sunlight.
I am also currently very keen on ferns - especially the one called "Dryopteris Erythrosora" of which I bought a specimen earlier this year. The plant has produced a succession of really beautiful bronze-coloured fronds, which gradually fade to green, so that at any given moment the plant has leaves of several different colours:
This plant is Cotinus (aka Smoke Bush) "Royal Purple". Its foliage is at its most intense in the late Summer, just before it begins to fade into various shades of orange and brown.
Here is another of my favourites: Cornus (Dogwood): It is one of those plants that has something to offer at every time of the year. This one is "Cornus Alba Aurea" - it has bright yellow leaves at present, and little berries beginning to form. In the Winter its bare stems are a bright red colour.
If you are also a Dogwood enthusiast, you might want to look at this blogpost I published last November: Dogwood Gallery