I like this is great and am gonna test that because I like the background image in the website.

Is it possible to add background image in default theme of elgg same as you added in space theme?

Don't see why not. 

I've tested the theme on 1.8.6, 1.8.7 and 1.8.8.

That's pretty cool Mike.

Muy bonito theme (Y)

Very nice !

Can we place different type of background image?