Usually I "toss out" unsolicited opinions about my quilts or designs. (I make them for me, not because I need 'outside' validation.)
Also bent pins
used needles
thread ends and clumps
scraps of paper
totally wampuss/what I consider irredeemable/mispieced blocks
the skinny strips from straightening a folded cut of fabric
old quilt magazines which have served my purpose (usually to the guild)
dull seam rippers! (My absolute pet peeve; they are so cheap, just replace the thing, for Pete's sake!)
dull rotary blades! (My next pet peeve, LOL!)
Jan in VA