Generate a charming birthday illustration that features a small, delightfully illustrated tractor in vibrant green, adorned with a pink party hat on its roof. The background is alive with celebration, decorated with pastel-colored balloons and a sprinkle of glittering confetti. A jovial sun grins from one corner, casting a warm, golden light on a banner that proudly hangs above the tractor, flaunting the words 'Happy Birthday' in frolicsome, bubbly letters. Generated with these themes: Tractor.