With constant DotA playing you might be bored of same terrain.
DotA Theme Manager allows you to change terrain in DotA.
You can change the terrain to:
You can always restore the normal terrain with the "resotre" button of the tool.
How to use:
All files must be placed in your warcraft 3 folder. Then you have to run DTMV4.exe (as adminestrator). Choose the terrain you want. Make sure that warcraft is closed before you try to change the terrain or it won't work.
This might effect the look of other custom maps too.