With the ice storm outside it gave me a little time to work on some PAPER ARMIE projects. The photos here show a magnetic board (36"x 24") mounted to the back of an office door, with Republican Roman and Gallic armies mounted to magnetic cards and attached. This board actually has a light 1"squares marked on it, but they cannot be seen in the photos. Price was $19.95 at Walmarts school supplies area.
The photo at top shows a close up of the Gallic infantry mass. These Paper Armies are laid out per BASIC IMPETUS rules, but by shrinking 50% on your printer you could use most of them for DBA style games as well. DBA on the back of a door might be ideal for those crowded dorm rooms.