Another harebrained thought was a NIP to maintain a memedirectory that simply assigns an ID to each popular meme background. Then you can pass that ID, topText and bottomText and the meme can be transmitted and interpreted and rendered as an image by any supporting client without transmitting anything but text, and retaining the decentralized relay hosting that standard memes do not (the centralized image host gets every viewer's public IP and all the images go down if the centralized image host crashes or shuts down).

Kinda irrelevant to your post, but I had to get this idea written out. Thanks :p