• bird's nests
• wasp nests
• cicada shells
• cool dead bugs (so far i have a mature cicada, a failed-molt cicada, a giant black beetle, various smaller iridescent beetles)
• cool feathers
• snapple caps (the ones with the facts on them)
• calico critters/sylvanian families

this is exclusively digital, obviously, but i also like to collect and sort transparent item PNGs and even images! my pinterest and postimage pages are examples of this ^_^