One of my neighbors has an extensive and cheap model railway growing in his garden for many years, it's all made up of stuff from boot fairs, not to scale but fantastic.
It has all the usual landscape stuff and even a gravel pit with conveyor belts, stream with frogmen, all very busy and the tiny rock plants and weeds look perfect!
The only thing he has bought are the engines, 3.25 gauge, cuddly tank engines, shunters an such, even got a couple of MVs so still on topic!