I dont know if this helps or not but I did a Halloween quilt a few years ago and I wanted Halloween Applique, that was before I owned an embroidery machine and could make my own designs. So here is what I did. I went online and found free coloring pages. I printed them off a few times each and traced around each piece adding the 1/4 inch seam allowance and used my computer to increase the size of each piece I wanted to do to make them larger. I then cut out my pieces and used them as my template and it turned out wonderful.
You might look up some pictures or coloring pages of different bugs and do the same thing.