A light blue would be sorta like:
colors[0] = "0.55 0.6 0.9 0.9";
colors[1] = "0.55 0.6 0.9 0.0";
This gives is a more tealish tint. Increase the 5 and 6 to make it approach white more. Increase the first .9 column to make it slightly more blue.
Nothing goes above 1.
The last number on each row affects transparency.
the [ 0 ] designates the color it has when it starts, the [ 1 ] is the color it has when it dissappears.