Chances are you& have a bottle of tomato ketchup in the cupboard or fridge. Many of the bottles are now the plastic squeezy type. Rather than simply popping the empty bottle in the recycling bin next time you finish a bottle why not have a go
Stacked lids, bottle tops and caps. Fun for kids, but would also make great garden art! I'd think the trick for doing this project is to collect as much different color, shape & size of lid/caps as possible before start putting them together.