Pinterest has released a listing of the top 100 Pin trends heading into 2019, which may help guide your on-platform strategy, and identify key shifts within your niche.
As per Pinterest:
"Pinterest is its own positive corner of the internet, where more than 250 million people around the world come to discover new ideas to try. The way we know an idea is trending is by looking at what all those people are searching for. If an idea keeps getting more and more searches each month, and that upward trajectory holds steady for 6+ months, that’s how we know it’s a trend."
Pretty basic methodology - so what's trending via Pin heading into the new year? Pinterest shares overviews in ten categories.

Rather than providing a separate, off-platform listing, Pinterest's top 100 aims to drive traffic back to the original Pins. They've provided summary sheets like the above, but in order to get the detail on each, you need to click through to the individual Pins, which are accessible via the main report or the dedicated Pinterest 100 boards on-platform.

Definitely, it's worth taking a look at the listed trends, specifically those within your niche. While Pinterest has comparatively few users to some other platforms (250 million MAU), it is growing, and Pin trends can be highly indicative of broader shifts, particularly in terms of purchase paths.
Various reports have shown that Pinterest is highly influential in driving shopping decisions, with Pinterest users coming to the platform in a shopping mindset. As such, the trends highlighted are likely more than just interest and/or discussion driven - these are things that people are actually, increasingly looking to buy, which is an important distinction to make.

If you're considering adding Pinterest into your social media marketing approach in 2019, the report is a must-read, but if not, it's still worth checking out the Pin trends in your sector to see what's gaining momentum.
You can read the full 'Pinterest 100: Top Trends for 2019' report here.