I have seen many cases with the engraved clear windows. I had desided engrave my wndows to give them a new look. This is not as hard as it looks just take your time and you will get good results.
Other case window instructables can be found on Instructables web site.
After looking a this look at at ( Part 2 )
Step 1: Plan Your Design
Plan your design.
Take the measurements of your window and draw whatever you want. Go for a theme or use an image. I just made some freehand drawings of flames.
Step 2: Scan in Your Drawing (Optional)
I scanned in my drawing of the flames and fixed it up in Photo shop.
using the filters-> Filter-Sketch-Photocopy
You get nice thick lines where the outline is in Photo shop
IF you want text or have your image pointing one way you will need to mirror the image.->Image-Rotate Canvas-Flip Canvas Vertical.
Step 3: Tools
Plexiglas - either from your case or buy some to make a window.
Dremel - or other rotary tool that takes engraving bits.
Flex-shaft - helps a lot to makes the tool feel lighter and avoid mistakes.
Engraving Bits - I used a 107. Any size will work. Smaller if you want detail.
Tape - to hold the template to the Plexiglas.
A good light.
Step 4: Setting Up for Engraving.
Find a place to work and lay out the template the way you want it.
Tape the template to the Plexiglas so it wont move.
I have 3 small windows on my case they are all 9"x7" I am only doing the 2 side windows.
Step 5: Start Engraving.
Work slowly and watch what you are doing. The slightest mess up can ruin your design.
Step 6: Put It Back in Your Case.
Put it back in the case and start it up. Enjoy your new engraved windows.
Part 2 will show a different etching effect that is why this is low detail. My engravings are not that deep. Latter on it will be deeper.