how about "Christmas Box" - Sarcococca humilis. The (small white) flowers
are not very noticeable but are highly scented. It flowers in winter and
will stand some shade. Or vinca (major or minor) - periwinkle - this is a
sprawling thing but comes with various leave colours and various (mainly
pink/purple) flower options.

--
Hayley
(gardening on well drained, alkaline clay in Somerset)