I don't do a lot with Terragen these days. Rendering times aren't improved much with multi-core machines on Terragen 1, so HD images can still take hours. Terragen 2 is inherently slow anyway. Though it's undeniably powerful, T2 lacks the amazing intuitve interfact of T1, so I never really played with it very much.
The text links take you to hi-res prints and images available from StockTrek images.