Code:
require 'OpenRGSS'

class Window_Bd < Window
 def initialize()
  super()
  @windowskin_name = "BirthdaySkin.png"
  self.windowskin = RPG::Cache.windowskins(@windowskin_name)
  self.x = 0
  self.y = 0
  self.width = 640
  self.height = 480
  self.z = 100
  self.contents = Bitmap.new(width - 32, height - 32)
  refresh
 end

 def refresh()
  self.contents.clear()
  self.contents.font.name = "Verdana"
  self.contents.font.size = 64
  self.draw_text(0,0, 640, 480, "Happy Birthday mq!", 1)
 end
end

$mq = Window_Bd.new()
while !(Input.trigger?(Input::B))
 Graphics.update
 Input.update
end
Leider konnte ich nicht testen ob die Schriftgröße passt, OpenRGSS ist ja noch nicht soweit =)

Alles gute mq..