[chuecaloversvvp]

I am only replying because nobody else did (though I guess it is already late in the evening and you are gone anyway) - I don't know much about the symbolism of colours, but for sure the flower offerings often come with yellow or orange marigolds or something similar, not sure about English name. yellow should be ok because golden-yellow is the colour of the Buddhist flag. white is also often used, not only for lotus.