Balloon tubes:  I bought a piece of the smaller mil (thickness) plastic painters drop cloth then cut it in half. We then did this with each of the two pieces: fold in half lengthwise and tie in a knot at one end and fold over twice (about 1/2 inch each) and staple up the side, fill with balloons blown up with an air compressor, then tie the other end off. We have ceiling tiles, so we just tucked the ties in under the ceiling tiles and zig-zagged across the ceiling of the hallway. We actually used two different pieces (packages) of the drop cloth which made four 'snakes' of balloons that were used consecutively.  I want to give credit to my decorator diva, Jenny D., who came up with this most excellent idea  I have been so blessed to have this woman on my ministry team.