I had a broken tail light and no luck finding a good one at a junk yard. Decided to fix it by making a new lens. I ran across this and ran with it. http://www.6gc.net/howto/make_clear_tail_lights It's illegal to have clear lenses and also illegal to have colored tail light bulbs. Heres how I did it but with patience you could make it look good.
Step 1: Materials and Tools
Materials Needed are: Office Lighting Covers I got a 2X4 piece at home depot. It's brittle so be careful. Something like this http://www.lowes.com/pd_227470-1390-DL2100_4294935637_?productId=1063037&Ntt=diffuser&Ntk=i_products&pl=1¤tURL=/pl_Lighting%2B_4294935637__s?Ntk=i_products$pageNumber=1$rpp=15$No=60$Ntt=diffuser$currentPage=5$totalPages=5
You are going to need glue some sort of liquid nails use clear glue I didn't....
Sand paper, Paint(rattle can), Red Glass Paint.
Tools: Dremel with diamond Cut tip. http://www.harborfreight.com/5-piece-diamond-mini-cutting-discs-31501.html
Step 2: Breaking and Painting
Now pry the old lens off, paint the inside with chrome spray real well but tape off the section your going glue so that it sticks to the plastic and not the paint.
Cut out with dremel tool and diamond bit approximately how much light diffuser you'll need if you have a corner to bend around use the soldering iron on top to melt through it enough that it will bend around the corner but not break and not leave a hole.
Put the glue all around the outside of the plastic casing and stick on the light diffuser. clamp it down using whatever and let it dry.