Echoing everyone else, the buckles are really good! A tutorial would be great, particularly with what thickness of wire you used, how sturdy/bendy they feel, etc.

As ForgeCorvus mentioned I think mushroom cultivation would fit really well! There are some great cave photos and mushroom photos here: https://www.loirevalley-france.co.uk/organise-your-stay/activities/discoveries-and-knowledge/cave-champignonniere-des-roches Definitely can't go wrong with roasted ...