For some great ideas, check out some of these ladies' work:
My friend VIcki in Germany made some really cool stuff for hers. She's doing a huge display at a castle ruin in her town of Badenweiler for the whole community to see. She's making most of her stuff herself:
http://s19.photobucket.com/albums/b172/ ... rs%202007/
Then there's DeadSpider's work, which is AMAZING. She's one of the best talents around:
http://aranamuerta.com/2007/02/20/witch-kitchen-jars/
Also, if you're making your own eyes and have a printer, these are perfect for making realistic irises:
http://www.hauntershangout.com/graphics ... syeyes.jpg
And showing how to make them:
http://www.hauntershangout.com/home/easyeyes.asp
And lastly, I made a list of some of the stuff I used in mine year before last:
Dead Man’s Fat Crisco shortening
Dried Hell Fire dried chili peppers
Dried Swamp Bottom-Dwellers dried shrimp
Essence of Death- water and blue laundry detergent mix
Eye of Goblin green pimento-stuffed olives
Eye of Newt  whole black peppercorns
Ghost Tears  tonic water (or water with blue laundry detergent)
Instant Love Potion powdered chocolate milk mix or cocoa powder
Liver of Salamander Turmeric (the one sold as pellets)
Muddy Swamp Water water with dirt and stuff in it
Pasteurized Werewolf Milk any white liquid
Pickled Liars’ Tongues fake rubber tongues in a yellowish liquid
Pirates Eyes fake eyeballs
Pixie Dust– cinnamon sugar or colored granulated sugar
Poison Ivy fake ivy vine pieces
Scales of a baby brown Gwardar Snake  Fennel seed
Spawn of Jack O’Lantern  green pumpkin seeds
Squid Ink water and lots of blue food coloring
Toasted Bat Wings Bat wings cut off fake rubber or plastic bats
Vampire Blood corn syrup and red food coloring
Warlock’s beard Chinese bean Thread noodles
Check out the ethnic food sections of your local grocery store. There are usually some pretty gnarly looking things packaged, particularly in the Mexican and Chinese food sections. You can think up some names for stuff with a little imagination. Also, take a walk outside.. there are lots of things right in your yard that can be used as ingredients.