I have a huge 13" diameter ball bearing from a display that was being trashed at work a while ago and it makes me feel very powerful. It's just an intense object to have in your hand.
i loved the part of early 2000s lego where they were just slapping bionicle parts on everything. bohrok shields in star wars sets. toa and turaga tools on race cars. the entire technic hockey theme basically. it was great.