Is there any other use for loot, besides selling it?
Solution 1:
These are collectively referred to as "Trade Objects." Trade objects can be sold, and their price varies depending on which type of vendor you sell them to.
Additionally, certain trade objects are required for certain quests from the vendors on Tiber Island. Finishing these quests can unlock upgrades to Ezio's equipment, which is generally going to be worth more to you than a bit of extra cash. The complete list of trade objects, along with their values and associated quests is contained in the linked wiki page.