"Pin holes" can be using found from boards, fingers, Venetian blinds, trees, etc. The further away, the bigger the image.
Eclipse projection from pinholes (very faint), 3/8″ holes and fingers criss-crossed.
Eclipse projection from Venetian blinds.
Eclipse projections from ~25 ft high live and ~80 ft high dead (and needle free) Balsam pine trees in British Columbia, Canada. Man’s sandals at bottom for scale. [Anonymous]
Pro: Size of image can be much better than with shoe box camera because distance is further. Compare images from different hole sizes. Multiple holes make fun effects.
Con: You might forget to look and find them!