I like the collections system, but I wish there were more collections to do, and it cant be hard for them to add more in the future. So in hopes that maybe they add some more in with future patches, here are my ideas for what other collections could be added
Bundles
-there are vendors around that sell items you can double click to gain a bundle (like a rock you an throw or something or elemental powder). There should be a collection for using all of these
Potions
- Use every kind of potion of _ slaying. Maybe that will raise the price of them and make people care a little more, though it would be short lived
Tonics
-Use every kind of tonic
Cultural Weapons
-Including Lionguard
Dungeon Specific Items
-There are trinkets and accessories that drop in certain dungeons like the Charred Back Brace from CoF or the Jar of Lost Souls from AC.
Badges
-Just like the spoon one, but with badges instead
Pact Weapons
Bones
Collect bones from around Tyria (Trash item bones, im pretty sure there is a weapon that is a bone, crafting bones, maybe even a couple collection only items that drop from AC or teq.
Cups
Collect cups from around tyria. (There are a couple cup weapons, cup accessories.)