Here are some things UU-Matter can't make that it probably should ( considering how UU is endgame get anything you want)
Uranium
Wheat/seeds
Pumpkins
Melons
lily-pads
Mushrooms (both kinds)
Emeralds
Nether Wart
Sugarcane
Mob Eggs??
Special IC2 crop bags???
Items from other mods?
More to come?