Recently I admired these adorable velvet acorns by Plush Pumpkins that were part of a giveaway on Nesting Place.
And then when I was out walking the dog, I came across these ginormous acorn caps on the ground - and I had to try my own.
Basically, I just started with a small fabric circle, (1) did a running stitch around it (none of this has to be tidy looking at all, since it will be hidden), and then (2) cinched it up by pulling on the thread. Leave the needle attached while you (3) stuff some batting inside the little pouch, and then (4) pull it tight and put in a few stitches to keep it closed. Then just hot glue on the cap, and you have some adorable little plump acorns!
Best part about this project aside from the cute factor: completely free, since I had various fabric scraps and stuffing around... I love the huge acorn caps I found (no idea what kind of tree), but it could obviously work with regular ones and smaller fabric circles. They're nice as a vase filler or stuffed into this little shadow box frame I have from Ikea: