Almost anything, right? But luckily, you don't have to dress up in mesh knit thigh high stockings and hang around knit-bombing street lamps to win some Malabrigo. Just follow the instructions on this gal's blog: http://icelandicgardener.blogspot.com/2010/08/malabrigo-yarn-and-pattern-giveaway.html
And just like that, she has propagated her blog throughout the interwebz. Ingenious!