Screenwriting : One Sheet Resources by Paul Houston

I am looking for on-line resources to complete a one-sheet for a story idea I have for a series. I need graphic and image options that I can use of the right size for this project. I do not mind paying something to get what I need. But if there are free resources, I would like to know where they are. I especially need resources for the graphics and image(s) I would like to use. Has anyone had success finding anything that worked for them in a do-it-yourself or semi-do-it-yourself project? There are a lot of templates out there for specific themes, mostly in business. There are also studios that support bands and music products that is not too far from what I would like to do. I have also seen movie poster type studio artwork, but it is a little over-the-top for me at a particular price point that I do not want to spend. Any one got any ideas? Thanks for your time in advance.