You don't have to twist my arm too hard ...
Everyone knows L. optica 'Rubra', but not everyone in England has seen one flowering.
Not everyone knows 'Hammeruby' but they are every bit as striking and if anything are easier to flower in England.
But my favourite red mutant is L. olivacea 'Red Olive'.
I'm not such a big fan of the green mutants, but L. otzenaiana 'Aquamarine' is a nice one.
You don't have to be a mutant to be striking. Here is L. gracilidelineata, the somewhat vaguely defined pattern cultivar 'Cafe au Lait'.
Some are bigger than others. This L. aucampiae has heads each two inches across.
While this whole L. werneri clump is two inches across.
And when you get bored with the flowers, the capsules that open and close are fun too. L. lesliei has some of the biggest seeds in the genus so not very many in a capsule.
L. gracilidelineata has much smaller seeds (but not the smallest in the genus) but capsules more or less the same size, so lots of seed in each one.