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Photographs (or scans) are the first choice for stuff like that in my opinion (the color can relatively easily be edited), very likely you can find numerous fitting stock images.
Sorry, i do not notice Your stand for brushes... Please ignore my message.
Or You can just use splatter brushes, You can find them all around web, like so: Splatter Free Brushes - (841 Free Downloads)
2 people found this helpful
I'm starting with a preset like this
Size jitter - Pen Pressure minimum diameter 20%
Dual brush with the other brush looking like this
Foreground / Background colour jitter set to Fade value 200
A tiny bit of Opacity jitter 25%
Build up checked
Air brush enabled in the options bar with these settings
Work from left to right building opacity.
If I was doing this properly (for myself) I'd take time with the dual brush to give me some light splatter. Also play with opacity probably using lower settings. But this is all trying to be a bit too clever IMO, and it would be easier and more effective to build the colours and merge with the Mixer Brush, which is very effective, but takes some practice to get predictable results.