Rust...you mean patina? :lol:
It's a cheap cruiser from Biltema (in Sweden), made in China I think. It was actually the bike that triggered me to try and build a bike! I wanted to build bikes when I was a kid, but didn't do it and eventually forgot about it. Then 25 years later I bought this bike and decided to take it apart and paint it to make it a bit nicer. While reassembling it I remembered the feeling I had when I was little, and decided to try my hand at it. Bought a welder and got going...
I think I've got photos of the bike before and after paint, I'll post them if you'd like to see better what the bike looks like without the snow.
Tosa, that looks like a Christmas bike!