I don't think creative is very interesting if you have no goal in mind, yeah.
I rebuild levels from my favourite games. Though I have little interest in Minecraft as a whole, as a building tool, it's about the most fun thing there is. ;P Maybe you could give that a try? Kokiri Forest, Peach's Castle, Pokemon towns, whatever interests you.
If that's too much, maybe you could try other large-scale builds like mansions or cities you couldn't otherwise make in survival.