Since there are no proper official icons for Valgrind (except a design that isn't very good at small scales), I've just implemented one that looks like the 'V' from its wordmark:
Alternative
I have also made the original logo into an SVG which could be used instead (but again this doesn't look great when it's small):
For reference, this is the original (official) Valgrind design I'm talking about:
Icon for Valgrind suppression files (*.supp)
Since there are no proper official icons for Valgrind (except a design that isn't very good at small scales), I've just implemented one that looks like the 'V' from its wordmark:
Alternative
I have also made the original logo into an SVG which could be used instead (but again this doesn't look great when it's small):
For reference, this is the original (official) Valgrind design I'm talking about: