Fragments have to be of the appropriate skill level in order to skill up. In other words, once you get past the skill level 1 Fragments, you'll have to get them from Salvaging (whether it's you or someone you buy them from).
For everything else, you can use the 1 skill items all the way to 200 (in fact, there are currently only 1 skill Containers). You will, however, make shitty Talismans, but that's the trade off for easier skilling.
Sindraya, Assassin
<Ravensflyte>
"Oh, hell no," Kylar said. "You cannot fly. Tell me you can't fly."
[Sindrak (DoK), Wingus (Choppa)] | [Drakhon (Thane)]