I will post my board as soon as I make it!
Here is the tutorial-
Props to Jelly Bean Junkyard
What you'll need: plywood board or foam board, brown paint, 30 coin envelopes, variety of scrapbook paper, vinyl or printed numbers, glue stick, Mod Podge, ribbons, hole punch, white cardstock, glue gun
Make it: Paint your board brown. Cut off the top part of your envelopes until they are 3 ¾-inch tall, and glue scrapbook paper to the front of each. Then, use Mod Podge to glue on the numbers 1-30 -- you can cut them out of paper with stencils or use stickers or vinyl. After your Mod Podge is dry, hole punch two small holes in the top of your envelope and tie a small ribbon through the holes. Use your hot glue gun to attach the envelopes onto the board -- five rows and six columns. Cut out a "Give Thanks" title and Mod Podge it to the top of your board. Insert a small piece of blank white cardstock into each envelope. Each night in November, ask your kids to pull the cardstock out on the appropriate day and write down something they are thankful for that day.
Here is another version from Embellishing Life Everyday.