Start attaching-pebbles use hot glue,but if little hands are sticking them down, you can also use a super-strong double-sided tape, such as the type used to lay carpets. It’s entirely up to you how closely you’d like to pack those pebbles, as the grouting
Faerie Garden in a lantern! I have one, though I'd love to get my hands on a little faerie figure like this one! I have a battery operated tealight in my lantern, but I like the plant idea. Maybe succulents.