http://revach.net/article.php?id=1089

Section: Halacha   Category: Tshuvos
Succah Decorations That Were Made For Non Jewish Holidays
If a decoration was manufactured specifically for a Non Jewish Holiday may one use it to decorate their Succah?  The Chassam Sofer (OC 42) says it is permissible since we hold that it is Hazmana B'Alma, merely preparation to use for the non Jewish purpose. Hazmona even for avodah zara does not make the item forbidden.  Additionally the sale of the item is considered a bitul or nullification of the intent of avodah zara.  Lastly it was not intended to be avodah zara or to serve the avodah zara, it is only decorative.

The Shevet Halevi (2:10) says that even if it is written on the box that it is made for the Non Jewish Holiday it is permissible.  Moreover he adds that since it was made by a machine and not a person, a machine cannot have intentions for avodah zara.  (Moadim L'Simcha)

While most poskim do not have any objections, the Halichos V'Hanhagos says that Rav Elyashiv holds it is a "Davar Michuar", it is ugly to bring these decorations into the Succah, although it does not say that he assurs. 

Important Note: We bring this tshuvah as a starting point for discussion and not to convey any halacha. We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. One should learn the tshuva to verify the accuracy of our interpretation. Please understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.