Second Mitt Syndrome??

I've heard of second sock syndrome and gosh I hope I don't fall prey to second mitt syndrome. I finished my first "Diamond Handwarmer" - not in the yarn as originally intended, but in this pretty grey alpaca (oh so soft) which made the pattern stand out better.

So, already, I'm "cheating" on my diamond mitts and eyeing other patterns and thinking about other yarns in my stash.

I'd better dash off now and cast on that second mitt before I fall prey to the syndrome.