Hello, apologies if this isn't the right place to ask this question, but I've been searching the internet for a while and I'm afraid my needs are too specific as I've had no luck. I'm not actually creating something for my garden, but it's garden adjacent and with the intention of making something with my own hands with things readily available, so I hope this forum is close enough. You know of fairy gardens, well I'm creating a fairy jar of sorts. It's a large 2 gallon jar, I've added the pictures below. (The beer bottle cap stool is for scale) I want to make the outside a cobblestone exterior out of rocks and seashells and things. The idea is that it's all over the jar except the backside, where one will be able to look in at the fairy house inside. I've made the roof out of pine cones and the doors and windows, but I'm not sure how to complete my cobblestone dreams. I've seen some people say cement can stick to glass and some can't. Is it a specific type? Do you think I could make it stick to the jar and then stick rocks on it without sliding off? I wanted to use cement (preferably brown or gritty) to make it look natural, like mud or clay that the fairy could've done itself (perhaps with the help of some strong mice), which is why I don't want to use glue. But could I use grout? I have no idea how to go about it. Can anyone help?