create a mixture of a glowing colorful nebula and paint splash that i can use for a background color for an astronaut, digital art image,volumetric lightning,vibrant colors of a dark palette,high resolution,glowing lights effect, use dark blue dark purple light green yellow and some orange, meant for a t shirt design so the background around the nebula should be white so it is easily removable background,make it more as in a paint splash kind of way instead of a realistic nebula