Coworker: We need your team to do the following spreadsheets immediately, can team member X do them? Thanks!
Me: Sorry, team member X is really tied up and I wouldn't want to give them any more projects ATM. I'll take care of it.
Coworker: thanks! Please hurry!
Me, 2 hours later: Here's yer spreadsheets, please let me know if you have questions or feedback.
Coworker: These are great, thanks! One minor detail, I'm not a huge fan of Old Times Roman, could you change the font to Arial or Calibri?
Me: They're your sheets now, you can do what you want with them