/// <summary>
/// Creates a new sprite with a random texture and transform
/// </summary>
private void addSprite()
{
// Assign random texture
Sprite s = new Sprite(textures.ElementAt(r.Next(0, textures.Count)).Value, 50, 50);
// Transform sprite randomly
s.Position = new Vector2(r.Next(-8000, 8000), r.Next(-6000, 6000));
float scale = 300.0f * (float) r.NextDouble() + 0.5f;
s.Size = new SizeF(scale, scale);
s.Rotation = (float) r.NextDouble() * 2.0f * 3.141f;
sprites.Add(s);
}