You could try using a 'Dark' green welders sheild? I used one on my scratch build lid... works fiine if your on a budget.. there are others on the bay of fleas too. I'm sure others will chime in with other suggestions... hope that helps
There is a seller on ebay that sells the acrylic ones. Also, Bobamaker sells them, I highly recommend them. Or you can buy the welder's shield, if you want the accurate dark green for ESB- http://www.discountsafetygear.com/noa8154g.html
You may be able to get them at Lowe's as well, then you just have to cut to shape