So I had a crack at a few more of these and Balliol was included. The crown and lion were difficult so I took some liberties and utilised some of the pre done stuff that was on wikipedia. I still had to reshape and colour alot of it and work it into the shape of the arms but I can't take 100% credit for it.
azure a lion rampant argent, crowned or, per pale gules, an orle argent.
I believe I've got the above blazoning right. The arms are the impalement of the arms of Lord Balliol, and his wife Devorguilla but unusually she, being the one to give the college its first statutes, is in the position of honor on the dexter of the shield, her husband is on the sinister.