Here is the thread for posting your submissions to be used as backgrounds in the Microbe Stage. The page for this can be found on the wiki. We have several important guidelines:

  1. Backgrounds should be seamless and tileable.
  2. A background must be sized so that its tiling isn’t clear, even when a player has zoomed out to the maximum extent.
  3. If possible also make a grayscaled version so that it can be recoloured.

Also if you can make some bubble layers that can be added on top of your background so that we can produce a parallax effect like with the current background:

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