Hmph, wish someone had told me that sooner...then again, the pianos I've banged up in the past weren't exactly "mine" and certainly not "dear" to me, or anybody for that matter!
When I'm sad, I play the Liszt/Wagner Tannhauser Overture (still a work in progress though)
When angry, Chopin's op. 44 polonaise (also a WIP)
Confident, just about anything, but perhaps a Liszt HR--not because they're extremely difficult but because they're so satisfying to play, and sound much better under confident fingers.
Tired, I usually just improvise (which I do in any of the moods, as well)
And, in truth, I am never frustrated at the same time I'm playing piano. That mood is one that goes away instantly with the feel of the keys to my fingertips. Though I really did trash a few pianos, but that was because I was only frustrated with the instrument itself--for instance, a terrible old upright I "had" to practice on while in school a few years ago...I felt like Chopin playing, because no matter what I did, the instrument would never sound above a mF...then one day, a few keys stopped sounding, period. Ahem.
How about happy? I'm usually for a Chopin waltz, Bach P&F (or Bach-Busoni's D major organ P&F, also a WIP lol), Haydn sonata, and so forth.