Just a bit of fun. For example, instead of Tom Nook and his family, it's Crazy Red and his family. You can also post your reactions to some ideas as well.
you can change the scenery! like in pocket camp how rn they have the tulip field as an option, or you can select what falls from the sky if its not snow/cherry blossoms/etc.
I would make it so that all the flowers which were introduced in Pocket Camp are available in New Horizons. There are so many neat and awesome flowers in that game, like the dahlias, irises, plumerias, morning glories, marigolds, heart roses, zinnias, and so so much more!
All items that come in multiple colors can be customized to that color. (ie. you can turn a white stove into a blue stove, or a pink drink machine into a white one.)
I love decorating and having to trade for different colored items is awful.