embarrassing - I haven't seen your post until now.
It is hard to pick a darling. Each project were quite different and had their own pros and cons. But i.e. the stage design and control design for the Mira Festival 2012 was pretty fun job.
We designed a stage with a big volume and two circular screens, made a custom mixer/scaler/mapper/titler with madmapper and vdmx, build a collaborative live mapping workflow for all artist performing so the only had to worry about content and not the mapping. Connect and perform http://v5.dslnc.com/portfolio/mira-festival-2012/