What are these small, plastic pieces?

They were found right outside our side door, a couple weeks apart. Pen for scale

Calico Peak rd, High Rolls, NM [OC] [4032×1816]

Mt of the Holy Cross, Colorado (2000x300 oc

Tre Cime di Lavaredo [OC] [2000x781]

Svartisvatnet (Black Ice Lake), Norway (8192x6144) [OC]

[OC] First Day of Fall in the Eastern Sierra Nevada, CA [4025x2315]

Had an early breakfast at Gudbrandsjuvet, Norway [5481x3664][oc]

3 Waterfalls in Geirangerfjorden, Norway [4551x3599][oc]

Another shot of Iguazú Falls, this time from the Argentina side [OC] [9654 x 3887]

Doe Lake, South Frontenac, Ontario Canada [3024x4032] (OC)

Geysir, the original Geyser, Iceland [OC] [939x1319]