For those not into making models, how about some prefab creations?
Make a placeable (perhaps a statue), and give it a description with some unique history. Maybe it was taken from the hoard of a dragon, or found in the ruins of an ancient castle. Maybe a large crystal was dug up by dwarves and presented as a gift to their king (who gifted it to the PCs for aiding him against a drow army).
How about non-magical treasures? An ornate gold-hilted sword that once belonged to a prince that was eaten by an ogre before the PCs could save him. A helm that was the symbol of leadership for an order of paladins. A miscellaneous treasure that is rumored to attract dragons.
Maybe a prefab NPC is more to your liking? A young dragon that the PCs hatched from an egg and is now kept as a sentry at their base of operations. An NPC spouse that a PC once rescued from slavers. An NPC bard that sings the heroes' praises every time they visit a particular tavern/inn.
Maybe make some new art assets...
How many times have you had to bring back a monster's head as proof of slaying it? Individual and/or piles of severed monster/enemy heads...goblins, dragons, ogres, orcs, etc. Maybe some other parts...a dragon's wing, a giant's foot, or a displacer beast's hide (with tentacles).
How about tokens of thanks for saving villages/towns/kingdoms? A golden ale stein from the father of the dwarven lass you saved from a tribe of goblins. A finely sewn cloak from the old lady you saved from a werewolf. A sheet of paper granting you title to a castle, courtesy the king. A locket from the princess that ran off with you and you "saved" by later returning her to the palace.
Feel free to use any of these suggestions, or make something else entirely.
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Come on, folks! What else are you making (besides some treasure piles and a troll head on a spike)?
