Sending flowers at such a sad time is an excellent way to express your feelings and love, especially when you are unable to be there in person. It is a way to say that you are thinking of and care about the bereaved, as that message can be so hard to put into words.
Perhaps a hand tied bouquet of simple colours - ie. green and white or pale yellow and white, or a vase arrangement or a design in floral foam could be considered. You will find some examples on this page and in the bouquets and floral arrangements pages.