I think a basketball would just a fun little thing to add in Grounded. It's recipe would be pretty simple (something like 2x bug rubber, 2x berry leather, and 1x silk rope.) You would obviously use it with the basketball hoop. It would be quite bouncy, so if you threw it straight down, it would bounce right back up. When shooting it, you might be able to see an "arc" show up on your screen so you know where to shoot it.
Also, I think a new mutation, called "Baller," should be added for the basketball hoop. You would unlock tier one after making 20 throws into the basketball hoop. You would then unlock tier two by making it 50 times, and unlock tier three after making it 100 times. This mutation would increase jump height.