Hey, while researching what smurf comics I wanted to buy, I dug up some trivia that Johan and Peewit were Peyo's favorite creation. Smurfs perplexed him a bit for becoming so famous.
I thought that info was funny and a bit ironic. I sympathize with Peyo too--Johann and Peewit, from a creator's standpoint, were probably more interesting to write about. They just aren't "trademark-ish" / catchy. Blue guys in white hats are something you notice and remember.
I'm embarrassed that I can't re-locate the website that said this about Peyo, but the Wikipedia entry for him alludes to it (he worked on Johan and Peewit comics, but had his studio do some of the smurf comics under his supervision).