Lately I've been landscaping areas of my mod in the style of Morrowind's snowy Solstheim Region as it appears in the Bloodmoon expansion. This is taking longer than it should because I'm always forgetting what each of the rocks or trees look like. I grab the wrong one, then have to erase it and try another.
So I created a reference guide, "Klinn's Bloodmoon Terrain Catalog". That's a rather grandiose title for three simple graphic files. They show the rocks, trees, snow, and ice chunks used in Bloodmoon along with each item's ID code. Here's some reduced-size samples showing what they look like:
I find it very handy to prop these pages up beside the computer as I'm working on exterior cells. All images are designed to fit on an 8-1/2"x11" or A4 landscape format page. A printer with 1200x1200 dpi will give best results.
I also created similar catalog pages for Morrowind's West Gash Region. These two pages show the rocks and trees used in that region along with each item's ID code. Here's some reduced-size samples showing what they look like:
Before you ask, I do not have any immediate plans to produce similar sheets for other regions of Morrowind. Maybe some day, but right now my mod is taking up any time I can spare. But nothing is stopping you from creating your own catalog pages! Go nuts, and share the bounty with your fellow modders.
If you're looking for other item guides, Srikandi has put together extensive lists of other objects in the Construction Set including furniture, lights, kitchenware, room tiles, caves and much, much more. You can find the listings here.