I used a mix of real and fake pumpkins, sharpie marker, sisal rope (available at the hardware store) and ric rac ribbon (from the craft store). You'll also need a glue gun or your adhesive of choice.
Sisal rope and jute ribbon are two of my favorite crafty items...they are inexpensive and always add great natural texture. You can glue strips of jute in a stripe pattern around the pumpkin. or wrap one completely with sisal rope.
Another cute accent is black ric rac ribbon. Again, you can glue stripes directly to the pumpkin, or leave the ends loose on a baby pumpkin to give it a spider effect.
The options are endless, but I made myself stop with these! You can check out these and other projects on my blog, Hi Sugarplum!