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.

Shopify Forms lets you easily add a form to your store, so you can convert visitors into leads and, eventually, sales. Create inline and pop-up forms to collect wholesale leads, subscriber signups, and essential business information. Add colors and images that match your store’s branding, incentivize with discounts, and translate your forms into different languages. Use submission data to build customer profiles and personalize engagement. Plus, analyze performance metrics to learn and improve.