Help emergency spare room help needed

[FrameyMcFrame]

We have an exchange student coming next week and for one reason or another I've left it very late to sort out the spare room. I need some help on colours as I'm terrible with this sort of thing... please help!

I've de cluttered so it's a blank canvas, planning on buying new curtains, new duvet cover and a rug...

In the room there is a nice traditional pine double bed , large book cases and a pale green carpet which I can't change. The walls are white.

What shall I go for with colours??

Light green and/or lemon accessories possibly?

Pale green or grey walls, plain white bedding with an accent throw and cushions and some patterned curtains in a darker shade of the walls?

Some ideas?

They've all gone for white curtains but I'm not sure they're practical in keeping the light out.

More ideas

Thanks for the ideas...I'm also worried about white curtains. I think I'll do the room and leave buying curtains until last.
or is that a bad idea.?

In our old house I deliberately had white curtains in the east facing spare room so guests didn't sleep late. Nothing annoys me more than guests who rock up for breakfast at lunchtime.