Creating Something BIG

Hey guys from the internet i was wandering if you could give me some ideas for projects on Minecraft? I have built a theme park which is huge! I need something big but at the same time ill stick with it and not get bored of it. I love if you guys left a comment saying some suggestions. Also when you are leaving a comment saying what to build tell me what blocks i should use for it to make it look EPIC!!!!!!!!!! Thx guys for participating and leaving a comment. Thx! -Boxmore