Door Knockers and Heraldry

Here are some interesting door knockers I may try to take cues from for
revising my logo:

















Also, looking at some family shields:















The Greyjoy Shield, from George RR Martin's Song of Ice and Fire series.











My family crest! For the logo, it could be interesting and fun to use the traditional meanings of colors and shapes in heraldry. Also, the top figure (it's a greyhound in this one) could be changed out for each genre.