We had cheerios themed food...cheerios "rice krispie" treats and cheerios snack mix (thanks, Tappy!) and homemade donuts (thanks, CC!) displayed in a large bowl of powered sugar to to look like a big bowl of cheerios.
The bunting was pre-made and purchased from Michael's. I just cut the letters that say "Knox is One" from cheerios boxes and the "O's" from kraft paper to look like cheerios.
You can see Knox's sweet outfit in this picture. I had it made by Room to Romp on etsy. She is very talented and I was able to request that she hand stitch the 1% milk appliqué onto a john john. I thought it turned out really cute and acknowledged the first birthday without limiting him to wearing it only at his birthday party. It's cute enough to keep on wearing through the year and the applique she did coordinated with his precious invites, designed by Southern Stationery.