Just a few things I whipped up using the most excellent and praise-worthy Coat of Arms Design Studio
by the same genius who brought you Hexographer
. Buy them! Buy them all! They are some of the most intuitive and above all USEFUL programs any DM could ask for. I believe it took me about an hour to do all of these, and that was coming at it cold, unfamiliar with the program.
One advantage these have over simply scanning in the heraldry from the various printed materials is that the images are in .png format, meaning they can scale up or down perfectly without much of any distortion. Crystal clear. Loveitloveitloveit.