Wooden blinds, plain cotton or canvas curtains with tab tops or a lodge print fabric would give the cabin a rustic feel.
I would use customized window treatments for a picture window.
Get window wallpaper with UV protection.
You can get custom window treatments at affordable prices at your local Lowe's or Home Depot. They have great selection.
A great place for information on window treatments is Calico Corners. Check out their website at www.calicocorners.com/category/custom+window+treatments.do for information on draperies, shades and more.
Cotton is cool and cheap, and can have colorful designs.
There are numerous places one can shop for curtains to be used as window treatments. Macy's sell a variety of stylish window treatment curtains. In the UK Laura Ashely offer a high quality selection of such curtains.
Window treatments for bay windows can be found online at HGTV. At HGTV they have put together what they think are the best 6 window treatments available. Also one could check Wikipedia for information.
There are many sites for DIY window treatments as well as many books and magazines that can be found in the local library or thrift stores. You can even watch TV and they have DIY projects on certain channels. The DIY network has some great ideas.http://www.diynetwork.com/topics/window-treatments/index.html
Treatments such as blinds or curtains without strings are recommended for children.
"There are many different types of window treatments and selecting product can be difficult. Fortunately many home improvement stores such as Bed, Bath and Beyond, carry product. There are a wealth of online stores such as Overstock that also sell treatments at competitive prices."
Opaque privacy glass is the best glass for bathroom windows. Block glass also works great depending on the window. If none of those work, a regular double paned window will suffice and then you can put window treatments in the window for privacy.
There are several types of window treatments that will work for multi-paned windows. It really depends on your personal preference and the look that you are trying to create in your home. You will just have to measure your windows before you go shopping.