To me all this shapes that you show here looks relative easy to (re-)create. The only thing that you most probably won't achieve is to be 100% equal. Since we don't know what settings, workflow and tools the original artist used to create them. I doubt it was Gimp though. I second Pior's wish here. Give us an example and…
Okay, sorry for getting back to this late everyone, had a crazy busy time these last 2 weeks or so. Finally had some time to breathe and wanted to check in. Thanks for all the info, and I'll try that photopea thing and see if it helps with my PNG issue, much appreciated! I'll see if I can make more examples when I get a…