HGTV. com You can search what style you like and look at plenty of designs by professionals.
Google; bathroom; modern; Victorian; contemporary ; whatever you may be looking for.
I can at least help with the dark color portion.
Check out http://www.coloradofauxpainting.com/faux... and click on the Benni-Moore link.
This would open a bedroom window to an interactive trendy color viewer that allows you to pick a special place type and then change the colors on the concrete walls to see which ones you like.
There is also a function that allows you to upload still images of your own into the website and then change the colors.
It's trully good cool- wish that helps a bit.
For more decorative faux painting tips and ideas about brown color, visit http://www.coloradofauxpainting.com/