Fortunately, this type of item can be found very easily. Look for the mint flower, for example, which can grow everywhere in the game.
You can also find Mint and Glazy Lily that will count as blue elements and that you can find in the gardens near the palace in Liyue.
So ends our guide on where to find blue items in Genshin Impact, we hope it was as helpful as possible, and you managed to complete this event as quickly as possible. Remember that we already have a lot of content about the missions of this event in our guides that we recommend you review.