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.
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.
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.
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.
Sierra Trading Post has a great article on choosing window treatments based on your windows, decor and needs. You can read it at http://www.sierratradingpost.com/lp2/window-treatment-guide.html. One of my favorite sites, Dummies.com. has an excellant guide for choosing window treatments. You can see their advice at http://www.dummies.com/how-to/content/using-curtains-and-draperies-in-your-home-decor.html.
Horizontal blinds (for large window treatments) on the other hand, such as cellular shades and wood blinds, work best on windows that are taller, so you can find them at Lowe's or Home Depot.
I would use customized window treatments for a picture window.
There is a lot of information on the treatment and decor of bay and windows that can be found. This information may help you out: http://www.bhg.com/decorating/window-treatments/basics/bay-and-bow-window-treatment-ideas/
Protecting your window treatments from harmful UV rays is important because sunlight can fade fabrics, weaken materials, and change their color over time. The best approach is to reduce the UV entering the room without blocking natural daylight. One of the most effective ways is to apply UV-protective window films to the glass. These films block a large portion of UV rays before they reach your blinds or curtains. They are clear or lightly tinted, so you can still enjoy sunlight without worrying about damage. Many property owners take help from glass and film service providers such as SunShield Window Films, ClearView Glass Care, Southmen Protect and Preserve, and EcoTint Solutions. These types of companies generally offer guidance on film selection based on how much sunlight the windows receive. The mention of these names here is only to show examples of companies that handle such work, not to promote any one of them. Another good option is using curtains or blinds with UV protection lining. If you already have curtains installed, you can add a liner instead of replacing the entire curtain. Solar shades are also a practical choice because they reduce heat and UV light while allowing some outside view. Fade-resistant materials like polyester blends last longer than fabrics such as cotton or silk. You can also use sheer curtains as a first layer. They soften the sunlight and protect the main curtains behind them. The best solution is often a combination—for example, applying a window film on the glass and using lined curtains. This keeps your window treatments looking new while keeping your home bright and comfortable.
Double pane windows are very energy efficient. They provide an extra layer of protection from the cold. Shades or heavy drapes also keep out the hot sun and the cold in the winter. If you can't afford double pane windows, window treatments can also help save energy.
You can get custom window treatments at affordable prices at your local Lowe's or Home Depot. They have great selection.
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A lot of people claim that old newspapers are the best thing for cleaning windows. Vinegar and water is a good home recipe for window cleaner. For really large windows, a squeegee works best. Be sure to use ammonia-free window cleaner for tinted windows and other specialty glass.