The yellow and red blueprints are pretty standard. I don't know who first came up with the arrangement, but it's used by almost everyone streaming or making letsplay videos. For some reason I didn't see them in any of the smelting blueprints when I did a search, so I decided to throw them together and make them available.
The blue one is my own creation I came up with when priority splitters were first introduced. Saves a little power by cutting off the last smelter and beacons, but still completely fills the belt.