Conker tree gives conkers as seed. But IRL inside this is a hard brown nut that in my real life is a curiosity. so conkers should be "opened" for the brown nuts, or the tree have a chance to give when seeds picked, spawn on ground nearby tree?
Additionally, the brown nut could be crafted into a conker on a string. These were historically a toy, and were "battled" to prove the strongest conker. So, conker on a string as a separate curiosity?
Go further, have them held in hand, 2 players near each other, one will be destoryed, the other becomes proven conker. Repeat with 2 proven for veteran conker. Repeat with 2 veteran for champion conker. Increasingly valuable curiosity, you have to "battle" to create! (draw back - the 50/50 chance for win might create real, in game, gambling issues, i dunno)
Still, conkers are neat, and in real life are a curiosity to me every autumn.