The idea behind a velomobile is to use a recumbent bike, trike or quadricycle and put a fairing over it to cut wind resistance and give a bit of protection from the elements. They are mostly unknown in the US. Holland and Germany seem to be the major domains - they are more practical than a bike for long (say more than 10 mile) commutes, and less practical for parking. They also tend to be nearly handmade and expensive.
A few people have been making inexpensive fairings going mainly for wind resistance reduction. Pop one on a trike or quad and you should have a less expensive velo that can easily be converted back to the original state.
Firefly uses a mostly transparent body that lights up from the inside for night use. It looks like a design exercise, but could be a nice project for folks who know how to build stuff. There are a lot of nice (and not so nice) recumbent trikes out there. Catrike is very popular and good brand.
I wonder if bright lights inside would cause drivers to take note and render this safer than riding a bike? What is the limit for lighting before the police deem it a hazard (really bright flashes for example)?