The original Sesame Place signs were styled to look like the park logo (which in turn was styled after the Sesame Street "street sign" logo.)
The park logo hasn't changed much, but the old signage around the park has been changed.
Big Bird appared on the sign for Big Bird's Nest:
Rubber Duckie had his sign:
The Amazing Mumford had a sign with (possibly) the longest name of any attraction:
Twiddlebugs had two different attractions and signs:
Herry had his own attraction sign:
Herry also had a similar sign inside Mr. Hooper's Emporium. It said "Fun & Games":
Frazzle monster appeared, fittingly, on the Monster Maze sign:
He also appeared on a sign inside The Sesame Food Factory, over "The Hot Kitchen" section: