I understand that this post was made in good faith, and I personally am a fan of seeing a community-contributed livery. However, the idea has been floated around the community a number of times already, and could be found through topics like these.
As for having third-party developed liveries imported into Infinite Flight and brought to the market from there, there are a number of hurdles that has to be cleared before it is viable, though, you can still take a look at that here.
I am looking forward to seeing a post in the Features category soon though, you only have to remain active on the forum and you’ll soon have the ability to create a feature post there.