I have a glass lamp from my grandmother. It remained empty for a long time because I couldn't figure what to put inside. A layer of sand with seashells on top seems like the standard thing to put into any glass container but I don't have any sand. I walked around the house with the bottle thinking, "What can I put in here? What can I put in here?"
This past spring I picked a basket of small pinecones:
All the pinecones have been languishing in the garage, unloved and unused. I saw them and tried to slide one into the neck of the lamp. It was a perfect fit. The opening was just barely wide enough. The whole thing was obviously meant-to-be to I started pushing in pinecone after pinecone, trying not to think about how I'd ever get the dumb things out in the future.
Easiest DIY project ever. In that- all I did was put some things inside something else.
I still have a ton of leftover pinecones. I'll probably spray paint them gold since I still have a most of a can leftover from the gold toy lamp. And everything looks better spray painted gold.