All of the links above have part of what I've experienced at different parishes, however not one of these lists describe in full how we use the colors year-round at my parish. Even within my diocese, when Christmas/Theophany comes around, you'll see photos of gold, white or sometimes even red vestments. Pascha is either red or white, etc. The Typikon of the Church only talks about "light" or "dark" colors. The use of something more specific is just local tradition and therefore tends to vary, although many of them have become standard (e.g., I've never seen: Pentecost any color but green, Lent any color but purple, Theotokos feasts any color but blue) these aren't hard-and-fast practices.
Many churches in the Russian tradition would wear gold today, since Ascension is a Feast of the Lord. However, I've also seen white used often for Feasts of the Lord, and that is the tradition of my parish. We wore white today.