Here is a messy, but great dinosaurs tuff spot. What you need: Plastic dinosaurs; Fish tank plastic plants; Rocks and pebbles; Water, flour and food colouring for the goo (or liquid watercolours); Pasta, lentils, semolina for different textures. To make the goo just mix water, flour and colours to get a pancake batter consistency.
I’d say this was a good value buy. It’s not very sturdy and you might need to reinforce the neck to stay up, but for a fiver what else can you want? We needed a few days to finish it so it kept us going. Get your dino here: