In my younger days, a couple friends and I used to do a lot of low brass demonstrations and clinics. I had prepared a slew of easy "flex-band" accompaniments that could be used for middle-school or high-school bands to accompany one of us as a tuba or euphonium soloist. We did easily-recognizable tunes to help get kids off those squeaky trumpets and on to euphonium or tuba, and to show reluctant parents that low brass instruments were cool as well.
Long story short, I thought I had lost all of them (on disk and on paper) in the flood that ruined my basement four years ago, but I found some of them on an old hard drive about which I had totally forgotten.
I love the GPO tuba and the GPO woodwinds, so here is one of them, Anituba's Dance from the Peer Gynt Suite. EDIT: Revision in later post.
I am not a great mixmaster; in fact I just work in notation and draw in some controller data. My setup is simple, but I still enjoy doing these. Not a great work of art, but just fun.
I decided to accompany the solo tuba with a woodwind ensemble--Flute, oboe, E-flat clarinet, 3 B-flat clarinets, B-flat contrabass clarinet, and bassoon. Also present is, of course, the triangle. All from GPO 4. I moved the key up a half-step to put it in a more brass-friendly key (my friends played either E-flat or BB-flat tuba) and to take advantage of the great pedal B flat at the end.