#2
Diminished 7 (My Sweet Lord by George Harrison, perhaps).

add9 chords, 7ths, and 9ths.

You can probably get away with lots of "dissonant" chords if they're used to transition between two "consonant" chords (I use quotes because peoples' definitions of dissonant are different).
(Slightly outdated) Electronic and classical compositions by m'self: Check 'em out
#3
sus2,sus4, min7, maj(3rd as bass) (below)
eX
BX
GX
D1
A2
E0
'89 MIJ Fender Strat
Rivera S-120
'60s PEPCO Model 211 5w head
'60s Paul (Pepco) 1x12 tube amp
'60s Harmony H303a 1x10 tube amp