We need an icon for FileExporter for the beta feature page.
I think it would make the most sense then to use the Commons version for Wikimedia projects since that is what I understand to be the main use case.
I had a quick go at making a wiki-agnostic version using the MediaWiki logo. Not sure I'm a big fan since I'm not sure it relays the fact that you're sending it to a different wiki very well, but I'll include it here.
I could also put some thought into how a pair of logos might work (for importer and exporter) if that's something that people think is worth investing time into. Regardless, here are the working ideas.
If anyone has any feedback or ideas, feel free to let me know!
Here are the working svgs for 1 and 2. 2 seems to me to be the more promising of the two, but would need a few edits (like centering and a modified result screen) before it is ready to go.