Antique Trader - These sure bring back memories: Vintage Tupperware popsicle molds (#481 Ice Tups). Most every household seemed to have a set at one point or another. My mom would usually
Silicone Moulds Ice Cre Cream Mold With Lid Popsicle Mold Summer Silicone Ice Cream Mold | Fruugo ES
An American Housewife: Homemade Kool-aid Popcicles (using Kool-Aid and Jello gelatin)
Vintage Tupperware POPSICLE Maker Mold 344 Freezer Clear Set Holder Plus Extras | eBay