The canvas supported loading an overlay, with that you could organize pixeling. It also must be said that there didn’t happen thaaaat much on the canvas, it was absolutely possible to draw small things completely on your own.
The brony community was probably the best organized one.
The german flag itself was mostly unorganized. Simple flags work well without much organization. The little organization that was done was posted on !ich_iel@feddit.de
There was also some stuff posted in other communities, in this community and elsewhere. A little bit coordination also happened on the canvas matrix channel. I posted a proposal for artwork on the flag here: https://discuss.tchncs.de/comment/1683751
The Maus, EU flag and ich_iel banner were done by other people in other threads. I added to the !hessisch_iel handle, ich_iel banner and EU flag to my template later on since I distributed it via my webserver and it was easy to update: https://basxto.de/leinwand.png
I also did post a template on !pixeldungeon@lemmy.world https://discuss.tchncs.de/post/1430716 distributed via https://basxto.de/pixeldungeon_canvas.png
The void started here https://discuss.tchncs.de/post/1400702 but wasn’t really organized