Line pattern

Graphsize 600,600
fastgraphics
clg
for pic = 1 to 30
a=122 : b=rand^2 : c=rand^2: d=rand^2
for x= 1 to 600
for y= 1 to 600
color a+a*sin(b*x),a+a*sin(c*x),a+a*sin(d*x)
plot x,y
next y
refresh
next x
next pic