What do you like to do the most of in Creative mode? I like placing about 30 blocks of TNT into the world,light them, then look at the huge hole I left behind. Destruction FTW!
My favourite thing in creative would have to be making more buildings for my town/city. It's really cool and sometimes I even create my own logos. If I'm able to I can send a video of one of them.
I like to mess with mobs in Creative Mode. Poke Creepers, annoy Endermen, punch Skeletons, etc. then watch them try to get me without having to worry about dying. : d
If I have WorldEdit installed, I like to make giant spheres of sand (//sphere sand 100 100 (yes, my computer is powerful enough)). It's very entertaining to watch it fall ;P
I also like to make landscapes, because I rarely use the normal terrain generator.
I use Creative Mode to try out texture packs and mods so I can see all the blocks and items.
Seriously! I love mining!