index.js

var BASE_URL = "http://cheersfrom.bamcreative.com/image.php?name="
var foreach = require('for-each')
var request = require('request')
var temp = require('temp')
var async = require('async')
var gm = require('gm')

temp.track()

function getLetter(letter, cb) {
  console.log('Getting letter', letter)
  var stream = temp.createWriteStream()
  request(BASE_URL + letter).pipe(stream).on('close', cb.bind(null, null, stream))
}

function write(str, cb) {
  async.map(str.split(''), getLetter, function(err, letters) {
    var image
    var path = __dirname + '/' + str + '.jpg'
    foreach(letters, function(letter) {
      console.log('Appending letter', letter.path)
      if (!image) {
        image = gm(letter.path)
      } else {
        image.append(letter.path, true)
      }
    })
    image.write(path, function (err) {
      console.log(err)
    })
  })
}

write('fuck')