This is probably a project for older kids and adults – but if you or your children enjoy photography, here is an idea for you!
Use your camera or phone to make pictures of eyes. Perhaps you could take a picture of all the eyes in your family? What about including your pets? Maybe you could take pictures of your own eyes for a period of time…
Experiment with black and white photography, different lights (outdoor and artificial light produce very different effects), and the different ways you can edit your pictures after taking them…
Print your pictures and put them in your journal. Maybe you could get some printed bigger?