Instructions for this image:

1.  Draw gradient.  (Ctrl - J)   Default colors.  Vertical gradient (not vertcenter).  256 x 256.

2.  Edge Merge Seamless 1/4.  (Alt > I > S > M > 4)

3.  Lighten twice. (Ctrl - Alt - T)

4.  Rotate90.  (Ctrl - Alt - X)

5.  Mirror LR.  (Ctrl - L)

6.  HarmSwizzle setting 64.  (Ctrl - H)

7.  Rotate90.  (Ctrl - Alt - X)

8.  HarmSwizzle setting 64.  (Ctrl - H)

9.  Copy to Buffer.  (Alt > B > C)

10. Plasma Cloud setting 700.  (Ctrl - F4)

11. Select Line drawing tool.  Set the Pen color to Orange.  Set the Pen to MaskPen.  Make Pen Size 300.  Draw a line (it's a very big line that covers the entire image) from 0,128 to 255,128.

12. Gaussian Soft 5 times.  (Ctrl - Alt - G)

13. Set the Pen to XORPen.  Set Pen color to Blue.  Assuming the pen size and line tool are still selected, draw a line from 0,128 to 255,128 (Cover the entire image).

14. Map Texture.  (Ctrl - F2), use buffer.