Slapmap is a mod that allows you to import images onto maps using a set of commands and a stick. This mod allows for the creation, deletion, and easy placement of full images, without the need to worry about individual maps or item frames. It also does not need to be installed on the client in order to work on servers. Use "/slap help" when op'ed to get started.
The source code can be found at https://github.com/kalkronline/slapmap and my Discord is fennekal#0001 if you have any questions or would like to report any issues.