Who Needs AutoCAD?
Home builders work from plans that are usually designed in CAD products like AutoCAD, but if you really want to build your own home you can create your own plans by using MS Paint.
I was asked to produce a plan of a house based upon a photo of it. I carefully drew the outlines in a green colour on a black background, so it looks like a plan. To make the customer visualise themselves actually living there, I sketched him in, in his favourite hat with his cat.
Note: He ended up not making use of the plans. I think it is because I made made his cat look a bit too overweight from all the cake it was munching.