That's a half-good and half-bad idea. Many Muppets work beautifully as walk-arounds, particularly your average-sized humanoids and pigs. However, some Muppets don't work too well as walkarounds, like Beaker (spindly frame), Kermit (ditto), Bunsen (his head's too round) and Janice (too thin). The ultimate walkaround would surely be Sam, as his rather large stature, human-sized feet and big arms would both make it easy to make the character as a walkaround and easy for a performer to do. So, I'd love to see him walking around at MGM sometime soon. You know who else would work real well as walkarounds? Statler and Waldorf!