Try these on for size!

Pretty Polly parties perpetually.

Pretty Polly's parents are prim and proper party poopers.

Pretty Polly parties pertly and with prudence.

Prudence is her sister.

Round Red Robert rolls round rabbits, radishes and reflections.

Round Red Robert rolls Radiantly.

Rediculous, but Real.

I wonder how Bert's Automatic 'R' Detector would handle that!