Recommend any great piano duets?
You're in luck.... duet playing is my specialty!
In nonalphabetical order:
Mozart's 38th, 40th and 41st Symphonies
Respighi's The Pines of Rome
Mendelssohn's Hebrides Overture and the Octet for Strings in Eb+,
Dvorak Slavonic Dances and the New World Symphony,
Debussy Petite Suite,
Ravel Mother Goose Suite,
Faure Dolly Suite,
Rachmaninoff 2nd Symphony,
Tchaikovsky 5th Symphony,
Grieg Peer Gynt Suites 1 and 2, also the Holberg Suite,
Schubert Grand Duo Sonata
Smetana's The Moldau, from Ma Vlast.
You can also play the Max Reger arrangements of all of the Brandenburg Concertos.
The Symphonies of Shostakovich, Beethoven, Schubert, Mahler, Bruckner, and many others, are also available to play for four-hand ensemble.
All of this repertoire is highly advanced, and I wouldn't recommend it to anyone who isn't fairly serious about playing piano ensemble at the professional level.