How should I decorate the table for our pastor on his appreciation day?
However you think the Pastor would like. If you don't know your Pastor well enough on a personal level to do that; try asking their assistant or someone close enough to know what they'd like.
You'd at least like to use their favorite colors or some theme they enjoy. If they garden, some plants with ribbons can be used which the Pastor can later plant in their garden. If they love sports, it would be fun to organize a sports oriented day and decorate according to their favorite sport.
If the Pastor has a pet project, decorating around that theme might be a good idea.
Many pastors play an instrument. I've wondered if it's part of the curriculum at seminary. If your pastor plays, you could use music notes as big confetti.
How about getting a bed sheet (for the table cloth)and have people of the church, including children write messages to him. You could trim it with lace or fringe if anyone is handy in that way. It would be memorable, a keepsake and likely make his day. Let me know what you think. You could get markers for fabric so it could be laundered.
You and your fellow congregants obviously care a great deal about your pastor and appreciate all he does for you as a pastor. But remember that he must have lived twenty, thirty, or more years before ever entering seminary. He's an entire, complete person, not just someone who gives sermons. So what's he like as a human being? Who is he as a man? Think about a theme and gifts that fit his personality as someone who is a human being, a man, a music or football lover, an art or history enthusiast, a collector of stamps or antiques or shot glasses... and also a pastor. Treat the entire man as an honoree, not just the guy who stands in front and talks in church. He'll realize you appreciate his pastoring, but also love and respect the man inside the black suit with the backwards collar.