Dungeon geomorphs are a handy tool for whipping up dungeons for dungeon delving RPGs yet a lot of folks don't use them much.
I really enjoy drawing dungeon maps from scratch myself but I do find myself pressed for time and do enjoy being able to copy sections from geomorphs to make the map drawing go quicker.
Dungeon geomorphs allow the dungeon builder to establish a set of common features that look similar from time to time. There are a number of advantages in this. A DM may establish what things look like in a dungeon/campaign allowing brief descriptions once players become familiar with reoccurring features. Players that pay attention to the dungeon will be able to learn what features may be present by becoming familiar with repeating features and can make decisions based on experience not simply wandering about. The unique can be added to familiar locales making those unique features stand out even more and lastly players can become complacent and thus more likely to be tricked and trapped or even led astray by minor differences.
Dungeon geomorphs aren't very limiting they actually offer an immense variety in options. Just 2 geomoprhs square geomorphs that can connect in but the 4 main cardinal directions allow for dozens configurations with rotation of geomorphs (more if you can create reflected geomorphs with a computer art program). If you have a set of 100 or so geomorphs that can go together you have many billions of possible combinations. Introducing geomoprhs with greater variations in size and connections (like the ones I've been posting lately) and the ability to increase unique configurations in your maps increases.
Don't be limited by using the geomorphs alone. If you have access to an okay image editor yuo have the ability to create diverse and complex maps with plenty of unique features while takign advantage of geomorphs as I showed in my earlier example and here:
(click for larger image)
This map was created using my geomorphs and some digital tweaking. It took less then half an hour to whip up. It only uses a handful of geomorphs from this blog.
A feature of geomorphs and the computer age is if you enjoy miniatures play along with your dungeon delving geomorphs printed out to scale provide the DM with a set of dungeon terrain tiles that exactly match the map they are using.
dungoen gemorphs speed random dungeon generation immensely. Combines with a handy set of tables whipping up a dungeon (or a section of one) is speeded up immensely. There are a number of applications out there on the web that take advantage of dungeon geomorphs currently and one could craft one of their own with a little bit of programing know how.
Dungeon geomorphs can be built into decks (easier when they are the same size) that can have some duplicated more often then others to create a semi random placement where some features may occur on a more frequent basis.
Dungeon geomorphs are a handy and versatile tool in a DMs dungeon building toolset. The more the merrier.