I bought some catnip bubbles a couple of months ago and it's one of the few "toys" that my cat will actually play with. At first she was terrified of them but the second time I brought them out, she liked them. Now if she sees me pick them up, she actually follows me around begging to play, and she will practically crawl up my leg until I start blowing bubbles. (And she's not a touchy snuggly kitty either so this is a big deal for her
) She stands up on her hind legs and pops them in the air with her front paws. Or she'll pounce on them if they've landed on the floor - it's sooo cute.
I have been wondering about the "nontoxic" thing too, because Mindy licks her paws afterwards. I assume that since she is probably ingesting a very small amount it's ok.