Though I'm sure the answer to this question is more complicated than we think, a good place to start would be her website at Ffffound!. Ffffound! not only allows the users to post and share their favorite images found on the web, but also dynamically recommends each user's tastes and interests for an inspirational image-bookmarking experience. The above picture was taken from Audrey's Ffffound! page. So if you want to delve deeper into what Audrey's thinking when she creates her beautiful artwork or you just want to be inspired yourself, check out Ffffound!
