I've never really gotten much into it, but I've followed some people posting pup play stuff (usually videos) on tumblr and I find it just heart-meltingly cute. Also, I really like the masks, They can seem kinda weird at first, but the one's i've seen look kinda cute and dopey, and just happy in general like a puppy ^_^
In one video I saw in particular really stuck with me because you could see his eyes through the mask clearly, and with out being able to see the rest of his face, I could still tell his expression was this mix of glee and anticipation. The two pups got curious and WOWEE it's just so awesome.