If you are looking for winter colour and interest in the garden, and like Clematis, there are several winter flowering varieties. All three illustrated above are winter flowering/very early spring flowering and make a good splash of colour. The Clematis illustrated above and other winter flowering varieties are all available from Crocus, (affiliate link.)
One of the most commonly grown is Clematis cirrhosa, Freckles and 'Wisley Cream’ (which require winter protection) and Clematis cirrhosa var. balearica which is hardier H4, but may not survive a severe winter without protection.
There is also Clematis urophylla 'Winter Beauty' which is evergreen, scented and H3 hardy with small creamy white bell-shaped flowers.
Flowering in late winter early spring are C. alpina and macropetala and the very popular also is Clematis armandii, a very attractive Clematis when grown in the right place noting that it is also H4 hardy.