Cantatas for the Sunday after Christmas include BWV 152, BWV 122 and BWV 28.
Recordings of BWV 152 can be found here.
BWV 152 is an early cantata by Bach and is marked by minimal instrumental accompaniment.
Recordings of BWV 122 are listed here.
In BWV 122, the accompaniment to the Bass Aria is stunning.
Recordings of BWV 28 are compiled here.
Of the three "Sunday after Christmas cantatas," this one is the most upbeat, as it explicitly anticipates the New Year.