Heh, they do. You never quite realize how strange they look until you see costumes of them in real life. Patti Mayonnaise looks the most normal of the lot there, although the wig looks Photoshopped. Hair looks off for all of them, but then, it'd be hard to get hair to look like that without looking stupid. And Porkchop's the creepiest just because he isn't a dog. I'd like to see a costume for Judy, though it'd probably be an artistic picture with her lying in the middle of a vast field where some dead poet lies buried.
But overall, good effort for Doug costumes. It's been so long since I watched that show, I'd almost forgotten about all the weird colorful daydreams that Doug always has. My favorite episode was probably when Doug gets the Super Pretendo system, along with the latest game Space Munks. He plays it so much that at school the next morning, he can't focus on anything and imagines little rocket ships shooting missiles at Roger's face. I'm sure we've had days like that.
Then there was that Muppet Babies episode which had the Pretendo Entertainment System and a parody of Donkey Kong (I think they used a dragon in place of the monkey). Particularly memorable when Piggy runs up to Mario and ninja-kicks him off the stage.