The most basic Earthship Design. Quick and Inexpensive to build. Requires no mortgage., instead of tires, let's use a "HESCO Bastion" type set-up. Less labor intensive than packing tires, and the walls can be load bearing.
Old tires don't have to go to the landfill when they're no longer useful for transportation. You can color them in different colors and make a planter, make a swing for children, or you can make tire ottoman covered with fabric.