Here are some pieces for the harpsichord, though they would also work for other keyboards.

God save The Bull This is a set of variations in the style ish of John Bull from the Renaissance.


Loningdale Jig for Harpsichord A Bach like Jig.  (or an attempt at one).


Opus 4 for Harpsichord and Piano This is a twelve tone ish piece of madness from the 1980’s and my polytechnic days.  I had a habit of giving all of the pieces an Opus number then, hence the pretension.


Passacaglia Harpsichord A passacaglia in C, which works well I think.