So, I don't have that big of a collection yet, but I decided to share a few of the Pings that I do have so far:
P. gigantea, more than 5 times the size I got it
P. moranensis x ehlersiae
P. 'Aphrodite.' This one's been weird for me, the main plant flowering, then dying back, and now I have one nice plant and a bunch of plantlets everywhere...
P. rotundiflora x hemiepiphytica. This one nearly died on me, but has begun to recover....
Among my other Pings are lusitanica, primuliflora, grandiflora, and vulgaris, but the rest aren't exactly photo-worthy yet.