I think there have been some great examples posted on this forum. And then I just saw a great DIY page of a modern one that looked really simple ...might have been posted here too...
http://www.moderncat.net/2012/04/06/sashas-custom-modern-cat-stand/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed: moderncat (moderncat)
I didn't post that one, but I saw this one and loved it as Taj loves to sleep in drawers: http://www.moderncat.net/2011/07/07/diy-inspiration-designer-drawers-for-kitty/
