Here's a very simple but effective arrangement which would look good any time of the year, but looks especially good in winter, when there are lots of bare twigs around to use. I have made the arrangement in a brown ceramic bowl, with a thin piece of floral foam (only about 2" deep) down in the bottom of the container. The floral foam has been anchored to the container with a plastic pinholder, fixed with green floral fix, as it is not possible to anchor it to the container with tape. I then covered the foam with a thin layer of green sisal, but reindeer moss or something similar would do. Next, I added a few pink spray carnations, evenly spaced, and quite low onto the foam. I then used some knarled twigs of Sycamore (Acer pseudoplatanus), which had been blown down in recent gales. These were well weathered, and had moss and lichen growing on them, which I think added to the effect! The twigs were arranged loosely in a domed shape. Finally, I added some pink roses, arranged so that they nestled just inside the twigs, not too low, and not too high. See below for an overhead view of the design.

An overhead view of the arrangement.