We just published a bunch of photoswitchable yeast constructs (soon to appear in PLOS One). See http://www.addgene.org/Kurt_Thorn/. We have Longtine-style plasmids for mEos2, PAmcherry, and PSmOrange. I also have an older PAGFP construct on Addgene, and we made PA-TagRFP and PS-CFP2 (not available from Addgene). Young et al, Cassette series designed for live cell imaging of proteins and high-resolution techniques in yeast., has an mEos2 construct as well. Contact me for a preprint of the paper (although it's primarily about stably fluorescent proteins and we didn't publish any results with the photoswitchable proteins we made).