I’ve made an album of solo piano music, mostly original semi-classical/mellow material:
https://edwarddiehl.bandcamp.com/.
I must confess made with Mixbus rather than Ardour, but of course Ardour is the heart of Mixbus. Piano sounds made exclusively with Pianoteq, plus LV2 plugins LSP impulse response and some OvertoneDSP PTC-2A in Linux AVL-MXE. Also used ebu-norm to set final LUFS level (-16). Feedback most welcome, especially since I did not really know what I was doing on the mastering part.