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Possibly Crazy Quilt? You can see a bit of the intro with boxes here: https://www.youtube.com/watch?v=aMvCpFyp_Dg
Nah that ain't it, I remember it didn't involve puppets in the show.
I believe you're thinking of a Disney show: Out of the Box
https://en.wikipedia.org/wiki/Out_of_the_Box_(TV_series)
https://www.youtube.com/watch?v=ZCU0MrdI1Oc
Honestly, this theme song still randomly pops into my head periodically for no reason at all.
Nope that isn't it either, I remember one of the hosts was this goofy guy who was a little more heavily built.
On....second inspection out of the box might've been the one actually
There was this show where they did arts and crafts with kids on Nickelodeon. The part I remember most was the intro where they build a fort out of boxes and the inside of it is where the show takes place.