What's the best way to communicate the idea of teamwork? And how would you translate "We want this organization to function as a team." And "Everyone needs to be a team player." Or would you recommend something other than the "team" metaphor? Is there a clearer word picture to use? Any ideas are appreciated!

Our favorite terms for teamwork are tèt ansanm, pote kole, men kontre or kole zepòl  they all mean team effort, pulling together, or working togetther.  
"We want this organization to function as a team."
"Nou vle tout moun mete tèt ansanm pou òganizasyon sa a mache."
"Nou vle tout moun pote kole pou fè òganizasyon sa a mache."
"Nou vle tout moun fè yon men kontre pou òganizasyon sa a byen fonksyone."
"An nou kole zepòl nou pou fè òganizasyon sa a mache."

and you can also use other words like kolabore, kolaborasyon, tèt kole, or konbit.
"An nou travay tèt kole pou fè òganizasyon sa a mache."
"An nou fè yon konbit zefò pou fè òganizasyon sa a mache."
"Nou vle tout moun kolabore ansanm pou fè òganizasyon sa a mache."
etc...

UPDATE
also add: kèk konbit, yon konbit (a "konbit" is group of people that gets together to work on a project)
Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words