The easiest thing you can do is to add falling snowflakes, which might sound a little cliche, but it always grabs the attention in a good way. This app will not only add snowflakes to your site, but you can also enable music. Another cool feature is the min and max falling speed, which creates a more realistic effect.

Add falling snow and music to promote a jolly a jolly and exciting holidaySupport 40 flake types and 10 beautiful Christmas songsWork with all themes. Even it works with any customized themes