I do like the planters, but I’d love some good old outdoor farming and forestry. Make foundation tiles that look like fresh tilled soil. Plant veggies, grains, tree sprouts, etc. When harvesting, you get the appropriate materials. Replanting options? Maybe get a seed from each foundation when harvested, or maybe it reseeds itself over time, much like the current trees and bushes, but on a much slower timer. Seeds or sprouts could be harvested in the wild. High percentage chance of getting the type of the bush or tree you are harvesting, with a random chance of other seed types.
Live in the desert and make your own oasis! Think of the landscaping architecture work that could be done.