In the new version of CSIDE you can import images as data URIs.
To do this manually, grab an image and run it through an image to data URI convertor, such as:
(There’s loads on the web, just Google).
Once you have your base64 data uri (a HUGE string of random characters), create a new scene file in your project. Name this scene file my_image.txt and paste in the data uri. Before the data uri type *image … So it’s essentially *image my_data_uri.
After the data uri, on a new line, place a *return.
Now you can do *gosub_scene my_image.txt wherever you want this image to appear. As long as you include this file during compilation it will also work in a compiled game
Downside: there’s a slight overheard in terms of image size, I think it’s typically a 33% increase on the original image size for data URIs.