Just a cheap and nasty fadeup hack.

#include <FastLED.h>

#define NUM_LEDS 32

#define DATA_PIN 12
#define CLOCK_PIN 11

CRGB leds[NUM_LEDS];

uint8_t ledctr = 0;            //


void setup() {
  delay(1000);
  Serial.begin(57600);
  FastLED.addLeds<APA102, DATA_PIN, CLOCK_PIN>(leds, NUM_LEDS);
}

void loop() {
//  FadeUp();

  newFade();
  FastLED.show();
  delay(33);
} // loop()


void FadeUp(){
  for (int i=0; i<255; i=i+5) {
    leds[ledctr].g = i;
    delay(10);
    FastLED.show();
  }

  if (ledctr++ > NUM_LEDS-1) {
     ledctr = 0;
     FastLED.clear();
  }
}


void newFade() {

  for (int i=0; i<9; i++) {
    leds[ledctr].g = pow(2,i)-1;
    delay(100);
    FastLED.show();
  }

  if (ledctr++ > NUM_LEDS-1) {
     ledctr = 0;
     FastLED.clear();
  }
}