Possessive for a third person and a first person
Solution 1:
You could transpose the words to "...work done by Bob and me" or "...work Bob and I did."
Solution 2:
I would rewrite the sentence to avoid this clumsy construction and use the humble pronoun our.
Something like this would read well:
Bob and I are working on a project; our work was a spectacular example of eloquence.
Or:
The Annual Report Writing Team was composed of Bob and myself; the team's work was exemplary.
Sure, there's a way to do it without pronouns, but it'd be clumsy and would simply call attention to the language rather than the message.