Here are some possible Thomas trades (other minor pieces and lesser draft picks included as necessary)
LAL - Thomas for Russell, Black
PHI - Thomas for both lottery picks (its own and LAL's - so say 4 and 6)
DEN - Thomas for Harris, Mudiay, Hernangomez
MIL - Thomas for Parker
MIN - Thomas for Lavine
ATL - Thomas for Schroder, 1st
ORL - Thomas for Gordon, and Payton or Hezonja
If NO keeps its pick (i.e. top 3) Thomas for the pick
If DAL ends up in top 3 - Thomas for the pick
All of those trades make sense if Boston moves Thomas and looks to rebuild. They aren't equal value for Thomas, but I don't feel they are terrible value either when you consider Thomas will be an expiring contract looking for a huge contract.