Any good flute or piccolo solos without accompaniment?

Easy to find - go to www.fluteworld.com, and browse their lists of unaccompanied solos. You will find tons of Baroque things (JS Bach, CPE Bach, Telemann, etc.), not much Classical or Romantic, some Impressionistic things (Syrinx, etc.) and LOTS of modern works - including many with extended techniques. Good luck.