NoTurns,

NoShortCuts!

Maybe you could start reading the manual? Especially this section may interest you. It explains how you can make rooms, and how to apply textures to them. That's the exact way how those nice floors you've seen were made.

Textures tile seemlessly to floors, so they should always fit. Imported textures do not behave differently, unless they're bigger than, say, 1024x1024 pixels. If you followed the manual and still have problems, come back here, and show us an image and your sh3d file. You can use www.mediafire.com to share them.

Hans