Thanks for the suggestions! I finally decided on the image of the community, and I decided to with a really cool image of a red clenched fist breaking through the floor:

I thought it could be symbolic for socialism/communism "breaking through" the lens of liberal propaganda. What do you think?

I also thought this one might have been cool, but it's US centric and also was originally meant to mock the Democrats by comparing them to evil commies, which I feel is the antithesis of this community. Either way, anyone actually prefer the one below?

I also like @[email protected]'s idea of someone reading communist works, and do want to use something like that as the banner, but unfortunately couldn't find an image with sufficient resolution or a horizontal aspect ratio. If anyone knows any image like that, please hit me up!