Speaking of avoiding stuff based on appearance - Though I can play a lot of instruments through my keyboard (keyboard + computer, load virtual instruments in the computer) I only use those at home to make soundtracks. I never take my keyboard onstage at church and play a trumpet. Mind you I have a very realistic sounding trumpet I can load (and an acoustic guitar and a really rocking electric guitar, and a nice flute, and a lot of other instruments...) but I don't play them at church. If I played my keyboard and a flute sound came out people would pay attention to me, not God. Regardless of what my intentions were, the result would be me showing off, even if I didn't want to show off at all.