Wander round a really good florists shop. They will probably have a selection of oasis and unusual decorative baskets and containers. And if you look in the Hobbies and Crafts section of any good bookshop they will undoubtedly have a number of illustrated books on flower arranging which will give her some ideas.
Scouse - if it isn't too much trouble - and if you have the time - could you please let us know if we gave you what you needed or if we need to keep looking?