Salaams & thanks for your query!

I haven't personally applied wallpaper myself, but please have a look at my Ask Nanima Pinterest board for DIY suggestions - http://www.pinterest.com/zakkiyak/ask-nanima-forum/

A great local supplier for wallpaper is Robin Sprong - wwww.robinsprong.com
They have beautiful designs that are unique and on trend. I am sure they will be able to assist with smaller pieces, contact them for info.

Hope this helps, Zakkiya