You could try changing all of your 2-row out for munich, which will result in a much roastier, maltier, fuller beer. They have similar yields according to my copy of How to Brew (80% for 2-row versus 75% for munich).
The problem you'll have is diastatic power. Normal 2-row has a diastatic power of 140
, while munich only has 30
. This could cause problems.
It would be easier and/or better to use munich as 33% (just guessing off the top of my head) of your total grain bill as a maximum.
EDIT: Consider using vienna or mild ale malt instead of 2-row if you're thinking about doing something zany.