[These are perennial in San Diego. Mine has now overrun three fruit trees. But it blooms most of the year.] Black-eyed Susan vine - you must plant one of these in your garden this year - it's the vine that keeps going strong all summer long
Tree Stump Removal --- Get rid of tree stumps by drilling holes in the stumps; fill them with Epsom salt; and wait. Live stumps may take as long as a month to decay, but will start to decompose all by themselves.
Insect hotel - Sustainable ideas including an explanation of the materials used, which insects they provide a habitat for and why you want that insect. This would be perfect to have as a project to build with a youth program
How to grow chickens.lol Prepare the pot. Place one uncracked raw egg in the pot — as it decomposes, it will serve as a natural fertilizer — and cover with soil. Read more: How to Plant a Vegetable Garden - Herb Gardening - Redbook
Spring Start seedlings in an egg shell so cute! Start seedlings in an egg shell and, when ready, plant the entire thing. The egg shells will naturally compost providing valuable nutrients to your plants.