PAAAAPERCRAFT/Papermodeling or whatever you like.
More sophisticated and quite frankly, looks better than oragami.
You can get models of just about everything for free. You can also get super detailed models of things to for dirt cheap (less than 10$). Tools are pretty simple, and you probably have most of them already. Exacto knife/scissors, glue (any will do really), tweezers, and some round objects to roll parts with. You can use a lot of stuff that you have really. I just happen to have quite a collection at my hands.