I came accross great idea when I play a game of dominoz. After playing level 23 of doom2 I had an real cool idea for a new map that might impress all.
You are in large outdoor area with arrows. Follow the ledge and you hear a Kunun like cretaure. When he shoot rockets he blows up all the cans like dominoz. Run back to start and exit lowers but if you miss exit a switch is revealed to at least two more exits. One on the rocks or you can face the Kanun youself with the big plasma gun and exit.
New from scratch
Oh, you can get stuck but at least acid kills fast!