Step 4: Sprinkles!
To add the sprinkles, find washable markers that match your thread colors. I used red, blue and yellow threads. Draw on the hat where you want to put the sprinkles. I did around 5 on each panel, and you will want to mix them up and make them angle different directions. Make sure you can get the marker out of the fleece, I ended up switching a few of mine around.
Set your stitching on a zig-zag stitch. You have to adjust it so it will look solid. Practice a few times on scrap fleece so you get a good feel for it.
Going one color at a time, sew in the sprinkles. This gets pretty tedious, but it looks good in the end.