and I'm the other collector of custard cups
I've been picking up the odd piece for a few years and now have 50 - 60 different designs - and after you've been doing this for a few years you begin to think they'll never end - and they probably don't. Same with jellies, they seem to go on for ever with limitless designs, and are possibly older than custards.
I think that like many examples of social/domestic glass they have their moment of fame and then become less fashionable - unless it's pieces as Neil suggests such as the double B handles, Lynn or diamond moulding.
It's when you see pieces from the Tim Udall collection, for example, that you begin to realize how appealing they can be -- but then you need a mortgage to buy them!
Must admit they have been rather quiet on the Board in recent times - but that may reflect their absence from usual buying sources, possibly.
Can't really think what you could use them for, other than small desert containers - they're too small really for anything practicable - could mix Polyfilla in them I suppose

Probably older if they have snapped pontil scars, and pressed examples are possibly of less value than cut examples, with coloured pieces - cranberry or amber of greater interest.
I hope you do get something for yours Julie
