How to Expand
Now then, the really cool thing about this game is that, since you make it yourself, you can modify it however you wish! For example, this is a fantasy oriented set. It includes cards such as "Wizard" and "Magic Wand". If that happens to make you uncomfortable, you can edit the set before you print it and remove or replace those cards with something else.
OR, if you don't like fantasy at all, don't print any of the fantasy cards, keep the cards in the "All" category, and use the GIMP templates to create some new cards. Perhaps a Science Fiction set, or "Gas Lamp Fantasy" themed cards, or a "Modern" set. You can do anything you want. Add cards of your family members and pets or ANYTHING that happens to catch your fancy! If you do create a new set, please consider sharing it with the rest of us!
Some great places to find public domain images are:
wiki media commons https://commons.wikimedia.org/
beinecke Rare Book and Manuscript Library https://beinecke.library.yale.edu/digitallibrary/
from old books https://www.fromoldbooks.org/Search/
new york public libary https://digitalgallery.nypl.org/nypldigital/index.cfm
flickr (the commons) https://www.flickr.com/commons/
wpClipArt https://www.wpclipart.com/search.html
public domain pictures https://www.publicdomainpictures.net/
art wallpaper https://www.art-wallpaper.com
old book illustrations https://www.oldbookillustrations.com/
clicker https://www.clker.com/
open clip art library https://www.openclipart.org/
gimp savy https://gimp-savvy.com/PHOTO-ARCHIVE/
free photos https://publicphoto.org/oldgallery/index.php?file=search_album/search
public domain photos https://www.pdphoto.org/
Republic Domain https://www.republicdomain.com/
Please Note that not all of the pictures on these sites are public domain. If you decided to download new pictures from them you'll need to play close attention to the licensing rules for each.