Is it possible to have more than 1 background image repeat

I know I can repeat a single background image in the y direction. But I want to repeat a few of them. I also want to resize them all so they fill the entire screen each. i.e. to give the effect of them being on top of each other.

I know I can use something like fullpage but I'd rather code it myself.

All I have is:

body {
       background: url("images/bg1.png");
       background-size: cover
}