// Shift from blue to green in RGB mode
colorMode(RGB);
for (int i = 0; i < 100; i++) {
  float r = 61 + (i*0.92);
  float g = 156 + (i*0.48);
  float b = 204 - (i*1.43);
  stroke(r, g, b);
  line(i, 0, i, 100);
}