LEGO Transparent Light Blue Tile 1 x 2 with Koi Carp Fish with Groove (3069 / 103319)

LEGO Transparent Light Blue Tile 1 x 2 with Koi Carp Fish with Groove has been used in at least 5 LEGO sets over the past year, since it was first used in 2023. You can also find this part in at least 2 other colors. It has a design ID of 103319 which can usually be found molded into the bottom of the part.