I just like lots of bunk beds. The curtains should be individual though because this is just asking for a fight.
The Coolest Kids Bunk Beds Ever
You can buy some stunning bunk beds or you can customise your own. We especially like the idea of making your own as you really get to make the most of the space you have like in the picture at the top. They have created such a great shared space and by painting the area behind the top bed, it feels like a mini room. So clever! http://petitandsmall.com/coolest-bunk-beds-kids-room/