Today the compositions with spots and splashes are very popular and choosing good colors can give a product or character and background to do so highlight considerably. Most of them are in high resolution and can find different painting techniques such as strokes, acrylic, watercolor, ink and more.
Photoshop Brushes:

-WaterColor Reloaded
-Watercolour Brushes Set 1
-Hi-Res Watercolor Photoshop Brushes Set II
-High-Res Grunge Ink Splatter Brushes
-watercolour brushes set 2
-Hi-Res Acrylic Texture Brushes Set 1
-Hi-Res Watercolor Photoshop Brushes
-26 free “destroyed” watercolour PS brushes
-Hi-Res Photoshop Brushes: Messy Spraypaint
-Splatter and Watercolour Brushes For Photoshop
-Brush Stroke