Vacuum Tube Display Case

I'm new to vacuum tubes and have accumulated a few dozen that are sitting in a cardboard box wrapped in packing material.

I'd rather put them into some sort of display case, maybe like the shallow, foam backed glass cases I have seen to display collectible coins or arrowheads, with labels. Seems like it would make an interesting conversation piece. At least to me, a budding tubophile.

Anyone have any suggestions, including sticking with the cardboard box?