My thoughts about a pocket park would be to research land ownership when coming across a plot of land that would make a viable project. CSU fact sheet #7.242 Native Herbaceous Perennials for Colorado Landscapes and #7.422 Native Shrubs for Colorado Landscapes would be supports for suggested plants.
The labor force necessary could possibly come from Colorado Master Gardeners as a project for garden project/plant select/ or display garden credit hours. The plants could also come partially from Colorado Master Gardeners when dividing and sharing their own gardens (such as Fall Harvest), along with fundraisers and donations throughout the year. The Salida park used a grant form Great Outdoors Colorado, along with cooperation from neighboring landowners, Salida Parks Open Space and Trails and the City of Salida Public Works Dept.