NervousGrid 02 #1

Generates a nervous grid that varies according to different randomised parameters:
GridMode (2, 3 or 4 columns);
Number of lines on each column (between 1 to 50);
Hue (between 100 and 230);
Brightness (0,60,100);
There is a 20% change of getting a BW grid (brightness 0);
.
On this second iteration of NervousGrid the columns width are constantly changing.
Hit "SPACE" to stop/start flickering