Dyson Logos set himself a challenge to produce 100 hand-drawn geomorph-tiles at his blog A Character For Every Game. You can read the overview of the Dungeon Geomorph Project which you can find here, or cut to the chase and download the collected and compiled set which you can find here. You can also find a Random Adventure Generator which is located here that uses Dyson's geomorphs. Very cool.
An example tile from the Dizzy Dragon Generator's site:
Swords & Wizardry Whitebox gets here.
In the meantime, it's time to start laying-out a bunch of blank geomorph boxes of our own...