We've already seen one designer's take on alternate NFL helmets, but now another designer has whipped up a batch of interesting unofficial designs. Paul Bunyan Design has workups of all 32 NFL team helmets, and they attempt to give classic designs a more modern look:
Tampa Bay Buccaneers
San Diego Chargers
New York Giants
Green Bay Packers
Of course, considering the Browns' idea of what constitutes a new design ("the brown is unchanged"), it might be a while before we see something this radical on the gridiron.