I know. That is the only way I see them. They work pretty good for that purpose but didn't the rules say that they need to be tillable 

Think of them as tiles/blocks for a puzzle game like Bejeweled or Tetris. 

There's too little contrast on the first 3, and too much on the last, in my opinion. Some stronger highlights could really make 'em pop :)

I don't really understand the transparent corners; as antymattar said they should be tileable.

 They need to be tilable you know.

I beleive this is for the weekly?

I like them, they remind of the boss from the Wing Dungeon in Zelda:Oracle of Ages.

http://www.zeldawiki.org/images/7/7d/Boss2_Head_Thwomp_moving.gif

Nice tiles, i like them

looks pretty nice- I can't make out what the red tile is though.

These look like they should be in a Tetris or Wario's Woods sort of game