I can't find a picture of it anywhere, nor have I heard mention of it anywhere, save in the actual Arby's that I visited for lunch today, but for $0.69, you can upgrade your beverage and acquire a massive blue cup with a huge Block M on it that says "I'm Thinking GO BLUE."
The cup is actually pretty high quality...not your standard disposable. The best part is....I did not see a corresponding MSU-themed cup available.
Can someone help me out with a picture or something!!!
Regardless of the cup, however, you should still love Arby's because of the Beef 'n Cheddar...just an FYI.