You can just download the image with greenscreen BG, and use an image cropping tool to remove the green from the BG, and make it transparent. Lots of them are available on the web, through websites and probably also for download but IDK, only ever used the web versions.
Thank you for the feedback! I should be adding a few more content on next update (maybe in a few months).
;u; Since I didn't know how to make it downloadable as a transparent PNG file I ended up puting the green screen for chroma key using as a solution, to be used like Rexizor said here.
