I hope these will be of use.
This one is billboard sized:
This cat be enforcing black cat's law in a white cat's town.
This one is poster/bus-stop sized:
THE GREEN LEL watches you whilst you sleep.
This one is poster/bus-stop sized:
This one is between billboard and poster size:
I have no clue what this was supposed to symbolize in my mind.
Me and Jackler run an OC page on facebook called 'The fictional board of fictional content' - if you wish to use anything on there, you're more than welcome, if you message us.
If you knew the exact dimensions for certain type of images (I,e billboards) that'd be useful, but if you need any help with images or logos in the future, I'm happy to help.