There is a photo contest by 
Every week on Sunday a new round starts and the motto is announced.
To participate, you have to publish a post according to the theme, then leave a comment and a link in the contestpost and use the tag #pobphotocontest.
There are POB tokens to be won, which will be distributed as rewards for the published post.
Also 
So it's worth joining in there.
This week's theme is small and here is my contribution.
I chose this motif because it's just a little everyone could do to avoid some rubbish.
This one little small cigarette butt could pollute 40 litres of clean drinking water when the rainwater washes the poison into the earth.
Thanks for watching and thinking about it.