They won't be lame to a beginner, who may have never made a tune in his or her short life.
Im sure that lots of kids, by the time they're in sixth grade, have at least sung a song and made some music. I'm not so sure that a new player would find those tunes "un-lame". In working with beginning band students, I've noticed that they are WELL aware of the tunes they play. Several years ago I created a middle school pep-band arrangement of "Come on Eileen" (yeah....I know, right?

). I just got a message from a friend who dug it out and is rehearsing it with his 6th graders. They are EATING it up and even in that piece (though watered down) there are many teachable things.
Some food for thought regarding this:
True, some children don't care what they're playing as long as their playing. However, whole notes and boring parts are going to be a HUGE part of a tuba players life. I think they deserve something (even at a beginner level) that is musically interesting (of course, developmentally appropriate. That is, I wouldn't give a player of 2 days something unachievable.) Foe example, why not use the excerpt from "Night on Bald Mountain"?It would be a great teachable opportunity for students because it has some accidentals (OH NO! Accidentals for a young tuba player???!!) but it also has a relatively simple meter. And of course, students will likely enjoy something they really recognize.
Something though I wonder as well is:
How do most method books begin? They use whole notes. A sequence of whole notes that the student is expected to play in time. However, aren't whole notes (as far as counting) some of the more difficult tasks, especially for beginners? Is there a way around that? I am not giving my opinion, but I'm just curious to see what sort of thoughts are out there on this.
Another point:
Don't be too afraid to challenge even new players. A player doesn't need to master hot cross buns before trying something more challenging. Maybe giving something a tad beyond, but have it be fun/interesting, would motivate him/her to learn at a quicker pace.
Keys!??
Why is it that many players are so afraid of keys? Because they 1) ONLY ever have to play Bb or Eb or maybe Ab in band, and 2) when they are expected to learn new keys, it's in context of scales...and frankly, scales are pretty boring to young players (YES, I know...this is a generalization..I'm sure theres some kids who go gaga over scales).
If we started a new generation of players on, for example, A major and Bb, instead of Bb and Eb, I'll bet scales may be a bit scarier. I'm not saying that we should. But simply, if we make things sound less scary for our students, then maybe they will have a different perception.
Sorry this is all over the place. My mind is running a million miles an hour and I gotta get over to UPS (

not tuba related, don't worry) anyway. I wanna hear what others think.