I happened upon this article and wanted to share it and also keep it as a resource for myself: When Do I Use the Different Reflector Colors
Also, at another place I looked it, they recommended using some clips (I like the C clamps, I don't remember what they said that they used) to hold the reflector in place if you don't have the stand. Great idea!
And now, I have a great wish list: I love the whole page full of goodies! ;)