I'm interested if anybody has customised any of their bard instruments, especially flutes. I don't think I've seen many customised, if any at all.

Share, share!

Kiusha and Myrrhime both have custom flutes as far as I know. I've been mulling over a Harp design for some time now, personally.

Sancero's got a mandolin. I think Corwin did, but I don't remember what he played.
It's remotely possible that Akia did when she was a bard, but my memory's really shot.
Sigh... alcohol.

Edit: If Clementius would have let me play harmonics with a drum, I would have.
I know, drums aren't terribly tonal.