What about a Chanukah sweater? Or Chanukah lights on a house?
By the way:
Xmas is a common abbreviation of the word Christmas. It is sometimes pronounced /??ksm?s/, but Xmas, and variants such as Xtemass, originated as handwriting abbreviations for the typical pronunciation /?kr?sm?s/. The “X” comes from the Greek letter Chi, which is the first letter of the Greek word ???????, which in English is “Christ.” The “-mas” part is from the Latin-derived Old English word for Mass. -Wikipedia