Be sure to pop over to the forums to check out the renewed terrain.png contest, remember the aim of the contest is to try to find new textures to replace the default ones which are packaged with the game download, emergency late entries are allowed up until this Sunday, with one more week of voting after that...
Votes are already open so come and make your opinion heard!
http://manicdigger.sourceforge.net/forum/viewtopic.php?f=5&t=622