Goofy figs.

[Whizbang Dustyboots]

I believe that 50 percent of the use LEGO knights and other medieval figs get is as miniatures for a roleplaying game.

 

[John Q. Mayhem]

I built a fiendish T-Rex out of Megablox. Called it Gargantutron.

 

[Krieg]

Once used a sleeping cat to represent an ancient red wyrm...the best part were her fearsome attacks of opportunity on any fig foolish enough to get close to her horde of gem dice.

 

[adwyn]

While in field camp in college we made minis from twigs, grass and fossils. Isolation will do strange things to a person.

 

[Shadowslayer]

Kinder Surprise toys. Nothing inspires fear in a party of low level adventurers like a dire bear rideing a unicycle

If you use the "Ringling Bros Circus Performer" PrC, he gets a tutu and a little umbrella too.

 

[Woas]

Not that weird, but I cut out the picture parts of older Magic: The Gathering cards that just sit around my house and collect dust and use them.

I use Pogs for large creatues. The pogs fit the 2x2 large creature base nicely.

 

[DarrenGMiller]

Strangest minis we have ever used?

HOMIES

DM

 

[wingsandsword]

I've used cotton balls for air elementals before.

I've used a transparent red d4 for small & medium campfires.

 

[jdrakeh]

Scale dinosaur models.

 

[Dannyalcatraz]

Edited because of HAL9000 malfunction.