Managed to get another testcard into the mix, yesterday.

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This testcard doesn't have a name. I've opted to go with "Testcard I"
BBC don't have a Testcard I, because I looks too much like a 1.
But since there's no proper name, that's the name I'm giving it.

From here on there's pretty much only Testcard J to add.
J is essentially the same as F, except for the border squares which have been rearranged and the bottom gradient's gone.
There's also a Testcard W, but as far as I can tell, that's just an F rearranged for Widescreen. .. Which the generator already does perfectly well.

I'll likely add J later today, and then have a hunt through the rest of the Meldrum site to decide on what comes next.
If you've any favourites, let me know!