My husband is very good with math and shapes, so he figured out pretty quickly how to make a 20-sided, 8-sided, 6-sided, and 4-sided set of dice out of cardboard. He cut these out and taped them together, then dug out Sharpies so we could start coloring them in. This is where I came in because I realized that a.) Sharpies smell terrible, especially for large projects like this, and b.) wouldn't acrylic paint work a lot better? Turns out it did, so I got put on painting duty, which is fine by me because I love an excuse to make a mess with paint!
Several hours later after they were dry I covered them in clear packing tape so they'd stand up to being rolled on stage and so the paint wouldn't rub off because acrylic paint on cardboard gets a little chalky. (I'll forgive my husband for giving me this time-consuming job since he did have to, ya know, write his comedy act and D&D game up.) We were quite pleased with the result, though! They ended up looking exactly like large dice- and they're evenly weighted so they function like dice, too!
They held up during his comedy show, so now we have the set sitting on our end table. The 10-sided and 12-sided dice are a little more complicated, so my husband is going to make them later so we can have a full set. He didn't have time to sort those out before the show, and really, who needs a 12-sided die in 2nd edition D&D? Unless you have a barbarian, they're kind of pointless. ;)