This guy put together a pretty awesome blank music sheet generator. It does bass clef of course, and bass tab (gross) but it will also do string trio's, grand staff, choir, and even a whole dang orchestra. He probably has something for a euphonium octet even. There are a lot, that is what I am saying.
He used the same killer, FREE, music notation program I used for most of the pdf examples up here and what the Book of Chord Tone books were written with. If you are looking for a completely capable notation program for zero florins, ducats or dollars, check out Lilypond.
If you just want free stuff off the internet for the minimal amount of effort, well check out this guys page and download all the PDF blank sheet music your hard drive can store.