Silhouette images and props
Brad Callen, I note that you have taken down the query about styles of images that the Doodly design group would like and use, as the few responses were generalizations and not giving specific websites as reference. I would really like to suggest silhouette images as the appeal is universal,
Pixabay.com has a range of free silhouette vector graphics which I enjoy because shaded figures are easy to trace draw paths for and are freely available without copyright infringements.