Here is a collection of free PowerPoint templates which have the similarity of outlines. This includes outlines of figures, objects and icons.

Black Fern PowerPoint Template

Truck Template

Cone Outline Clip Art

Freight Truck PowerPoint Template

Easter Clip Art

Star Clip Art in easy PowerPoint format

Nuclear Fusion Graphics Template

Spirograph PowerPoint Template

Swirl Fusion Graphics Template

Cross Outlines Clip Art

Neutral Dandelion Template

Fish Outline Clip Art

Cameo Silhouette Outlines

Full-length People Silhouette Outlines

Business Line PowerPoint Template

Head outline with brain

Brain outline

Crown Clip Art