After trying hundreds of seeds in an attempt to get some great looking extreme terrain i have found what i consider to be three of the best extreme (gargamel type) seeds...

-1800135187

-1784338777788894343

-9028489474908844496

Don't forget to include the minus sign at the start.

If you use any of the above seeds please post back here, and don't forget to search the whole map before posting any negative comments.