Are there any "rules"? I saw that there is no spending limit, but do people usually throw in a few other things with the socks?
with the exchange I have done the spending limit was approx. $20-$25 and people usually include something other than just socks. I've gotten tea, nail polish, a BoSox pez, loofa, candy, a card.
You can ask your draw secret questions on elfster to get an idea of what she likes, just remember to mark the box to keep it secret!