DonnaC, that's a great idea for repurposing. I did something similar to a TV base cabinet which I converted to china storage in a small apartment. I had one full width shelf cut from thick used glass. Of course, the edges and corners were polished. As this shelf is positioned just above the cabinet bottom, I can easily see contents of both levels.
Tartan, I like the idea of a pegboard for rulers. :-)
For deep lower bathroom storage shelves, I either use a plastic drawer set up the depth of the cabinet or an oversized baking tray with rim. For some reason, I don't do a good job of standing on my head trying to find something in the back of a lower shelf unit.
