Here are a few options, depending on what you're aiming for:
Direct Rhymes (not perfect, but close):
* "Pass of twenty twelve" - This plays on the idea of graduating
* "Mass of twenty twelve" - A bit more abstract, but could work depending on context
Near Rhymes (using similar sounds):
* "Last of twenty twelve" - Emphasizing the end of an era
* "Fast of twenty twelve" - Could be used in a humorous or ironic way
* "Blast of twenty twelve" - A more energetic and memorable option
Creative Options:
* "Class of two-o-twelve" - Changing the pronunciation for a playful effect
* "Class of twenty-twelve, the best there ever was" - A catchy and memorable rhyme
It really depends on the context of your rhyme. What are you trying to express? Let me know and I can give you more specific suggestions.