I was unable to find anything even remotely as large via Google, so I decided to render my own behemothesque Mandelbrot set on my computer (to avoid completely consuming the resources of the Zelaron server for a day or two). I'll probably make a 1 gigapixel edition tomorrow, possibly with additional color ranges. Also, I'll host the picture on my home PC in 1-2 days, to avoid wasting too much of Zelaron's bandwidth.
Edit: Firefox gave me an error about the image being broken at first, then I tried it on another computer, and it worked fine. I proceeded to try again on the former computer, and then it worked. Some browsers are probably prone to report errors due to its size.
"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram