I think a very basic version of Harvest Moon would be nice. You buy seeds, plant veggies and viola!: in no time you have a nice ripe veggie to sell in your selling box. 
I say... Carrots, tomatoes, potatoes and one type of tree you grab and take apples from.
In HM you have special tiles that you put seeds in. You water them with a watering can, and soon they grow big. Grab to take into inventory. Then, you'd sell at a farming shop. |
HM is the best farming game series ever!!!! And instead of having it in your house, you could add a new house called a farm and you can pick the diff. Styles just like the house and gang house.