Its the Motifs?
There are like 78 of them now, so the chances are good you won't know the motif unless you have been collecting motifs.
My advice, read the motif before you accept it. If you can't acquire the motif with reasonable cost or effort, sell it on a guild store, and buy a writ with a motif you know.
We are soon going into two events that typically drop a ton of motifs. Grind the events that drop the containers and troll the guild stores during the latter half of the events, motifs get cheap then.