Observe all kinds of things through your microscope. You might start with some of these, but your only limit is your imagination:
your skin
your friend’s skin (with consent)
all kinds of fabric
your hair
fur shed from a cat or dog
different kinds or colors of paper
a leaf
Keep Tinkering
Take your pocket microscope with you and look at whatever catches your eye, as long as it’s safe and you have consent, if appropriate (Mine is stashed in my purse at all times! -CLH)