Constraint breeds creativity.
When I want to take photos and I don’t know what to point my camera at I limit myself. My favorite way of doing this is to just take a single lens and photograph anything interesting as I walk somewhere. Since I am in school I do this either between class or on the way to class. Of course I need to give myself extra time else I feel rushed.
Another constraint is to just use a single focal length, I do this by taking my 50mm prime lens which forces me to stick to 50mm.
Only photographing flowers or buildings or colors can help stimulate creative photos as well.
A few days ago when walking to class a flare of yellow caught my eye. I was taking random photos and I found a pair of perfect sunflowers that were hiding in a median of the bike path. It was a good serendipitous moment.