They have been toying with clear valve covers since the 70's. I just ran across this thread while at work will be posting pictures of my cars later tonight when I get home here is a quick rundown.
1964 Skylark drag car 327,powerglide,12bolt posi, full cage, full aluminum interior... and much more(FORSALE TOO)
1972 Gmc Longbed 350, turbo 350, 12 bolt posi, Bagged on custom suspension(Work In progress)
1970 Chevy 4x4 Project/maybe part truck
1974 Chevy 4x4 350, turbo 400, 6 inch lift, big hub 44 front locked, 14 bolt rear locked
2002 Honda Shadow 863(big bore) custom exhaust, custom paint work
Those are all my toys. My roomate has some toys too. Plus all the street cars. I am a gear head tried and true. I collect cars like people collect tanks. Well I manage to collect alot of tanks too.