They are changeable aren't they? I've grown very few tangos, but this year I have a lot of 'Thesire' and a few seedlings, and I really notice the variation. Even on a single flower, one side can be heavily marked and the other side less so.
Some pics, first off this is 'Showoff', an Australian bred asiatic from Tonkin Bulbs:
Not a tango... but is it a brushmark? The markings are quite unlike any I've seen.
Some tetra seedlings from the exchange:
One of my favourite seedlings of the season. I used Patricia's Pride pollen a lot a couple of summers ago! I hope this turns out to be a good plant. First pic on opening and second pic taken about a week later. It still looks fresh today:
Love high contrast flowers!!
And finally,
Lilium lankongense...
...so beautiful!!