Japanese solar developers have made a solar house plant with thin film organic cells.
The only drawback against covering your walls with it would be combustion by-products if there was a fire. Otherwise it would make a great window awning or tint or vehicle roof covering (a solar convertible, maybe?). Maybe even a solar powered clothing.
http://techon.nikkeibp.co.jp/english/NEWS_EN/20080527/152443/
No links section, sorry.
