Getting Creative with Bottle Brick Fill Shredding

The variety of stuff to compact in bottle bricks is endless -- dead ballpoint pens, foam liners, plastic odds and ends, mesh bags.
It does seem to me that for flat plastic waste it would be much quicker to shred than cut. The folks at PreciousPlastic agree and have posted open source plans for building a shredder. The shredded plastic could be used for filling bottle bricks. I ruined my paper shredder by putting in lightweight plastic, which clogged the blades, just in case that brilliant idea also occurred to you!