The bug icons are very cute and very well done. However, before they are
used to represent the concept "bug-report" I would like to argue that
the images map to the concept through the polysemy of the word "bug" in
English ("insect" and "defect in a program"), and so they won't work
well for people that speak other languages. And adding a verb to the
image by making the bug appear writing a paper might not be
cross-language grammatically correct.
In Spanish, as an example, program bugs are commonly called "fallos"
(faults), so I don't believe that the image of a cockroach writing on a
piece of paper will make you think of the phrase "bug report" and then
convey it's meaning, but more likely, to make myself understood, it will
make you think of the phrase "ant writing" and then leave you a bit
disconcerted.