So I got a couple of questions asking how can you add grass and sky in Sketchup. There are a few ways you could achieve this, below is one way and probably the easiest way:
1. Click on the window tab and select styles (highlighted below):
2. You'll be presented with a new window like below, Make sure you have default styles selected!
3. Then you want to choose between earth modelling or simple style (both styles highlighted below):
And you're done!
Play around with the other styles to see what you can achieve.