If you donate to the town fund, you'll receieve a special feather to show off how charitable you've been.

Blue feather - Donate 200,000,000 Bells
Green feather - Donate 100,000,000 Bells
Purple feather - Donate 500,000,000 Bells
Rainbow feather - Donate 700,000,000 Bells
Red feather - Donate 400,000,000 Bells
White feather - Donate 600,000,000 Bells
Yellow feather - Donate 300,000,000 Bells