I'm with Moonpi. Classes on techniques are the ones I would consider. I'd like to learn paper piecing and don't think that's so easy to pick up on your own. Maybe something that teaches curved seams, Y seams, and/or partial seams...you know, non-traditional seaming techniques? Alot of folks are afraid of color decisions. Something related to easing that fear, like using a color wheel or paint chips. Ways to figure yardage, change a block size, adapt a pattern, etc. Think about what the most asked questions are here on the board. That should give you a pretty good idea!