Well, we've got quite an overworld theme going on. How about trying nether/end islands (like suggested above). Or, if you want it to be overworld, you could try out different biomes (eg sand, Mesa...)
Snow on top of everything, (like the floors) and some ice on the sides for decoration (you can disable smelting as well)
Yes this map is really good other then that I wanted to suggest a map with snow theme or ice theme which goes with coldnetwork and it can also have a penguin in center