It is bassicly like a trade sign but you just do something like 1 grass for a stick. That way people can donate you grass. There may be an other way but I found that being the most simple one.
Or just place some "donation hopper" with some chest attached to it, either way its a donation "chest" : )
To create a donation chest you need to have the following layout on your sign: Line 1 - [Trade] Line 2 - The amount of the item you want Line 3 - How much you will give them for it (You are able to put 0 to make it free) Line 4 - Buy
Grass Donation Line 1: [Trade] Line 2: 1 Line 3: 1 Then Right Click The Sign With A Cookie And Boom You Got The Most Fancy One. Diamond Donation Line 1: [Trade] Line 2: 1 Line 3: 0 Line 4: buy Diamond Donation Chest Without Extra Items. Classic Donations Place A Hopper On Top Of A Double Chest And Write "FrE33 stOof pl0zzZz" Like Noobcrew Did on His Island And The Chest Is Full Of Donations!
Lmao I just went to his island and donated some cobble and looked behind me and he was looking at me OOF