you could try what this enterprising housewife discovered, then follow with a clear coat.
A Young Wife's Tale: Berry Wood Stain
she did blueberries...
but her blackberry or raspberry samples look pretty pink too...
or you could go this route:
use a pink watercolor paint and then seal with a clearcoat...
but using berries might be a fun (and tasty) project for yer girls...
just make sure you put down plenty drop cloth :lol: