Decorative Goo

The Decorative Goo is a treasure found in  and. It is a used tube of blue acrylic paint.

In Pikmin 2, the label reads "" in the Japanese version of Pikmin 2, and "Mario Paint" in the American and European version, referencing the game Mario Paint. In Pikmin 4, the label is more generic with unreadable text, with the word "Blue" in bold alongside a yellow dot. Like other treasures in the Soulful Artist Series, this one is reminiscent of Blue Pikmin. It can be found in a sublevel with water and many water-based enemies, and is likely the first place the player will discover Blue Pikmin.

Collecting the treasure in Pikmin 2
It can be easily achieved once Olimar obtains ten Blue Pikmin. This is also where the Radiation Canopy was found in Pikmin.

Collecting the treasure in Pikmin 4
It is sitting atop a ledge at the north of sublevel 1 of the Secluded Courtyard. To collect this treasure, you must throw 3 Pikmin at it. You can also knock it down with a rush from Oatchi.

Treasure Hoard appearance
Oddly, depending on the region and area, the treasure will appear differently when viewed in the Treasure Hoard. In the Japanese version, the treasure always appears correctly. In the US version, the treasure always appears to float above the floor. In the European version, in all areas except the Perplexing Pool, the treasure again appears at ground level, but it lacks a shadow; in the Perplexing Pool, it looks the same as in the US version. All of these differences can also be found in the respective Wii re-releases for each region.

The reason for this is because in the US version, something unknown changed in the treasure's geometry, making it appear slightly above its origin point, compared to the Japanese version. The US developers did not realize this, and so the treasure is visually floating in that version. For the European version, this oversight was caught, but instead of correcting the model's data, the developers altered the spawn position of the treasure to be five units below floor level. While this does visually place the tube on the floor, it also means its shadow doesn't appear, since the object's Y coordinate is technically under the floor, and there is no floor below that to project a shadow onto. The coordinates for the Perplexing Pool have not been changed since it is very hard to even notice the problem, given that the treasure is underwater.

Trivia

 * Despite having a changed design in the North American and European versions, the icon for the Decorative Goo is unchanged from the Japanese version in Pikmin 2's Nintendo GameCube and New Play Control! releases.
 * A blue stain can be found where the Pikmin 2 version of the treasure is located, suggesting that part of the tube's contents was dumped out, likely by the Blue Pikmin found lurking near it.
 * The Decorative Goo is found near Blue Pikmin in both games it appears in, a trait carried over into the Soulful Artist Series with other colors.