Much as I love using stories and other texts as stimuli for P4C, pictures can also be brilliant.
Try finding some puzzling or provocative pictures. There are lots on the internet – here are a couple of sites I found in a quick search (sorry about all the clickbait!):
https://brightside.me/wonder-curiosities/23-puzzling-pictures-that-we-just-cant-explain-590460/
https://blazepress.com/2014/09/31-pictures-make-think-things-differently/
You can also use puzzling images as a stimulus for a creative thinking game, for example: In pairs, think of an explanation.
Get your pupils thinking and talking about resilience, barriers, beauty and more
Packed with example discussion scenarios, this book will help you raise your facilitation game
Using an unexpected event as a P4C stimulus
Creating space for students to discuss challenging current events
Try using a well-known story such as Goldilocks and the Three Bears as a stimulus for classroom talk or P4C
A professional development opportunity for P4C leads and teachers on Thursday 24th September
Philosophy for Children helps students explore their thoughts as a community