Getting a permanent mark on your body for a band has to be obsessive, it's not exactly casual is it? I do think a lyric is a better shout for those who really want to do it though. If you choose a good enough one (think carefully about this!) it'll be beautiful as a stand alone sentence. I've always been particularly opposed to tattoos as I have seen sooooo many people getting bad tattoos so casually, and I just don't believe anyone will love muse as much later life time "grandad/grandma what's that tattoo?" "oh that's a band i used to like 60 years ago". I just think people are too casusal with getting them done, but if you're honestly happy with them or you can confidently say you'll love it forever there's no problem is there?
-rich
p.s. I think any tattoo of muse in any shape or form would freak the band out. But it's not like they'll ever see is it?