I've been looking at options to put some kind of front panel overlay on the DIN rail enclosure. The best option I've seen so far that doesn't cost huge amounts of money is die-cut vinyl stickers. Looking at a service like stickeryou.com or stickerapp.com

Front panel dimensions and LED pipe/button locations have already been marked out in DXF format and converted to SVG for editing. Just need to dust off my photoshop skills and get something done...

In the meantime, I've been playing around with sprite-tm's esphttpd web-server code which works quite well. The actual code to control the relays on this via a web-interface are going to be quite simple. The challenge will be writing the html/css/js/ajax stuff to make it pretty.