Sonatas are excluded, as are movements from works that must be played together, parts of works that are allowed to be played seperately - ie preludes or etudes from a set, are included.
The basic rule is that they should be programmable seperately

Dohnanyi Etude in Bb minor
Scriabin Etude 8/12
Scriabin Prelude in E major (huge arpeggio one)
Chopin Etude op10no4,
25/12
Godowsky 25/11
Chopin prelude no8
Glinka -Balakirev - The Lark
Alkan - Increpatio (esquisse 10)
Alkan - Musique Militaire (esquisse 35)
These are what sprung to mind, there are so many more.
Yours?
