Aquarium decorations that can stick to the walls?

I just bought an acrylic tank and i need some decorations that will stick to the walls. i am even considering epoxy glues but dont know where to go. i saw that kahoots has wall decorations in their cichlid tanks but they dont sell them. i want to add more hiding places for my fish. what do i do and where can i buy some decorations that will stick to the wall?