Pretty much all you need for garden construction projects. I remember telling someone how important it is to designate an area where you can keep things you might reuse or turn into something else for the garden, but at the same time, to not let what you save out-measure the space you have for it. If you do that, you probably aren't using it and are one degree closer to having to make paths through your house to get to the bathroom.
It's true of all creative stuff. And things you collect. Designate where these things go. When that area is full, you can't put anymore in until some goes out. Easy peasy. I still have more books than shelves, so I'm working on that aspect, personally.
Recently I put up a bird feeder in the fairy garden, and Theron and I have enjoyed watching a remarkably wide variety of birds come through. There's also a birdbath I constructed in the new flower garden, from a plant stand and a shallow ceramic plant dish, this being half the cost of the cheapest birdbaths available. He helps make sure it's filled, being such a "correct" person, bless his heart.
I didn't mind at first when the squirrels found the bird feeder and knocked all the seed out. Birds just ate it off the ground. But then they tore into the begonias the man planted. And started chewing on the side of the feeder. And generally being the awful little rodents they are. So today I did this:
So we'll see if the wee little devils can scurry up the pole now.
Also, every year I use bamboo poles as much as possible to stake plants, tie things together, and so forth. Bamboo and sugar cane, totally renewable; look for stuff made from them. I constructed these trellises with bamboo and twine for some of the winter squashes. I know one side has delicatas (I bought a "harvest mix" seed packet, so silly, not doing it again,) and there might be a buttercup. These will do just fine on my makeshift operation. If one turns out to be spaghetti squash, as I suspect the giant on the deck might be, that will require some additional thought. The ones I was sure were butternut are in the little sunny center of the fairy garden, and may spread as they please.
The trellises have gigundous tomato poles in the center for support, trying to use less of that material, but at least it does not need to be replaced for a long time, same with my buckets and bins. I figure the key is to make it count, make it work well for you. That includes pretty white duct tape on the back of the birdhouse pole.