As a gold member, you would normally see the quizzes you've played in a colour.
In quiz lists, you have both a check mark and a colour for the completed quiz lists (i.e. those of whcih you have played all quizzes, at least five of them, and scored at least half on each quiz).
For crosswords it has (to my knowledge) not (yet) been implemented. If possible, I would applaud such a mark.
Hi,
When looking at another player's profile,
I can see which of their quizzes I've played,
but not which of their quiz lists I've claimed,
nor which of their crosswords I've played.