From the Super Mario Wiki
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Splart is a minigame in Mario & Luigi: Superstar Saga. In this minigame, Luigi hits Pump Mario with his hammer, sending water through one or more flying designbombs. The water and the dye then splatter onto a white shirt, coloring it in one of various patterns. This minigame is needed to obtain a Beanstar piece. Playing repeatedly and shooting every combination of dye to create all the possible patterns on the shirt causes the minigame's overseer, Harhall, to reward the Mario bros. with a single Woo Bean after each pattern, and Harhall's Pants after the final one.
Here are the possible combinations for each shirt design. Each shirt must have a color and pattern for it to count in Harhall's record.