Mushroom Island Biome
Single Biome
Normal Lighting (You can change to Bright or Dark Lighting if you prefer)
No Weather
Void
Boundless Sky (This is optional, you don't need it. All it does is it makes the sky look a little better. Works particularly well in void ages)
Normal/Dark Sun (Doesn't matter which one you use as it will be constantly night anyway)
Zero Length
Rising/Noon/Setting (This affects the position of the moon, assuming it's visible. Rising places the moon east, Setting places it west, and Noon places it in the center)
(Optional Colour here. Will affect the colour of the moon)
Normal Moon (You can change to Dark Moon if you don't want it to be visible)
(Optional Colour here. Will affect the colour of the stars)
Normal Stars (You can change to Dark Stars if you don't want them to be visible, or you could go with Ender Starfield instead which gives you the End stars)
Clear Modifiers
I've made pretty much the same thing in my 1.4.7 world and it works perfectly. I haven't tried it in 1.5 yet, but it should still work.
If you want more than one colour for your stars or moon you need to add each one separately. Note that if you do this for the moon the age will have two moons.
So for example if you wanted red and blue stars you need to add:
Red
Normal Stars
Blue
Normal Stars
