Okay, here's what I have so far (in the order they appear in the tileset):

"Normal" ground: 2 types, slopes, free-floating and grounded with discrepencies
Warps
Hurt
Vines: straight and angled
Signs: Directional, Text, Exit
Foreground Scenery
Pipes
Sprite Scenery (no mask)
Hooks
Background Scenery
Blocks: Destruct, stomp, 4-hit, #2, #5, #4, full speed
Faces of Jazz and Spaz
Various other parts

Animations are scattered throughout the items above.

I do need the poles, though! Thanks, Infinite Spaz.

I've tried belts and they didn't turn out so well. I might try them again.

Any other ideas?